EP3742820B1 - Verfahren zum senden/empfangen eines signals in einem drahtloskommunikationssystem und vorrichtung dafür - Google Patents

Verfahren zum senden/empfangen eines signals in einem drahtloskommunikationssystem und vorrichtung dafür Download PDF

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Publication number
EP3742820B1
EP3742820B1 EP19848045.1A EP19848045A EP3742820B1 EP 3742820 B1 EP3742820 B1 EP 3742820B1 EP 19848045 A EP19848045 A EP 19848045A EP 3742820 B1 EP3742820 B1 EP 3742820B1
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Prior art keywords
wus
information
iot
sub
resource
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English (en)
French (fr)
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EP3742820A1 (de
EP3742820A4 (de
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Seunggye Hwang
Changhwan Park
Joonkui Ahn
Sukhyon Yoon
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a power saving command
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H04W68/025—Indirect paging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/654—International mobile subscriber identity [IMSI] numbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to a wireless communication system, and more specifically relates to a method of transmitting or receiving a wake up signal (WUS) and an apparatus therefor.
  • WUS wake up signal
  • Mobile communication systems were developed to provide voice services while ensuring mobility of users.
  • mobile communication systems have been extended to data services as well as voice services, and more advanced communication systems are needed as the explosive increase in traffic now leads to resource shortages and users demand higher speed services.
  • US2014/211678 relates to an apparatus for wireless communicati ons that includes a receiver configured to wirelessly receive a message comprising a time for the apparatus to wake up and instructions to execute an action in response to receiving a paging frame from a wireless communication device.
  • the receiver is further configured to receive the paging frame from the wireless communication device.
  • the apparatus further includes a processor configured to execute the action in response to receiving the paging frame.
  • receiving the paging frame comprises comparing an address of the paging frame with an address of the apparatus.
  • the action may include one or more of sending a power save poll frame, waiting for packet reception, receiving the beacon, and receiving the delivery traffic indication message beacon.
  • An aspect of the present disclosure is to provide a method and apparatus for efficiently transmitting and receiving a wake-up signal (WUS).
  • WUS wake-up signal
  • an aspect of the present disclosure is to provide a method and apparatus for reducing unnecessary paging monitoring operations of WUS-capable user equipments (UEs) by efficiently transmitting and receiving a WUS based on UE sub-grouping for WUS transmission and reception.
  • UEs WUS-capable user equipments
  • a user equipment (UE) according to claim 8.
  • the apparatus for a user equipment (UE) in a wireless communication system, the apparatus comprising: a memory including executable codes; and a processor operatively coupled to the memory, wherein the processor is configured to perform specific operations by executing the executable codes, the specific operations comprising: determining index information indicating a wake-up signal (WUS) resource; and monitoring a WUS based on the determined index information, wherein when the UE supports machine type communication (MTC), the index information indicating the WUS resource is determined based on identification information of the UE, parameters related to a discontinuous reception (DRX) cycle of the UE, information about a number of paging narrowbands, and information about a number of UE groups for the WUS.
  • MTC machine type communication
  • the UE_ID is determined based on international mobile subscriber identity (IMSI) information of the UE, N is determined based on min(T, nB) and Ns is determined based on max(1, nB/T) where T represents the DRX cycle of the UE, nB is indicated through system information, min(A, B) represents a smaller value among A and B, and max(A, B) represents a larger value among A and B, and Nn is indicated by the system information.
  • IMSI international mobile subscriber identity
  • the index information indicating the WUS resource is determined based on the identification information of the UE, the parameters related to the DRX cycle of the UE, a sum of weights for paging carriers, and the information about the number of UE groups for the WUS.
  • the UE_ID is determined based on international mobile subscriber identity (IMSI) information of the UE, N is determined based on min(T, nB) and Ns is determined based on max(1, nB/T) where T represents the DRX cycle of the UE, nB is indicated through system information, min(A, B) represents a smaller value among A and B, and max(A, B) represents a larger value among A and B, and the weights for paging carriers are determined based on the system information.
  • IMSI international mobile subscriber identity
  • the WUS resource includes a resource in at least one of a time domain, a frequency domain, or a code domain.
  • the method may further includes, when detecting the WUS, receiving the paging signal in a paging occasion related to the WUS
  • the index information indicating the WUS resource hops over time.
  • a hopping pattern for the index information indicating the WUS resource is determined based on a system frame number (SFN).
  • SFN system frame number
  • a wake-up signal may be transmitted and received efficiently.
  • unnecessary paging monitoring operations of WUS-capable user equipments may be reduced by efficiently transmitting and receiving a WUS based on UE sub-grouping for WUS transmission and reception.
  • downlink refers to communication from a base station (BS) to a user equipment (UE)
  • uplink refers to communication from the UE to the BS.
  • a transmitter may be a part of the BS, and a receiver may be a part of the UE.
  • UL a transmitter may be a part of the UE, and a receiver may be a part of the BS.
  • the technology described herein is applicable to various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc.
  • CDMA may be implemented as radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented as radio technology such as global system for mobile communications (GSM), general packet radio service (GPRS), or enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • the OFDMA may be implemented as radio technology such as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), etc.
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • the UTRA is a part of a universal mobile telecommunication system (UMTS).
  • UMTS universal mobile telecommunication system
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of an evolved UMTS (E-UMTS) using the E-UTRA.
  • LTE-advance (LTE-A) or LTE-A pro is an evolved version of the 3GPP LTE.
  • 3GPP new radio or new radio access technology (3GPP NR) is an evolved version of the 3GPP LTE, LTE-A, or LTE-A pro.
  • the LTE refers to the technology beyond 3GPP technical specification (TS) 36.xxx Release 8.
  • TS 3GPP technical specification
  • the LTE technology beyond 3GPP TS 36.xxx Release 10 is referred to as the LTE-A
  • the LTE technology beyond 3GPP TS 36.xxx Release 13 is referred to as the LTE-A pro.
  • the 3GPP NR refers to the technology beyond 3GPP TS 38.xxx Release 15.
  • the LTE/NR may be called ⁇ 3GPP system'.
  • xxx refers to a standard specification number.
  • the LTE/NR may be commonly referred to as ⁇ 3GPP system'. Details of the background, terminology, abbreviations, etc. used herein may be found in documents published before the present disclosure. For example, the following documents may be referenced.
  • FIG. 1 illustrates an example of the 3GPP LTE system architecture.
  • a wireless communication system may be referred to as an evolved-UMTS terrestrial radio access network (E-UTRAN) or a long term evolution (LTE)/LTE-A system.
  • the E-UTRAN includes at least one BS 20 that provides control and user planes to a UE 10.
  • the UE 10 may be fixed or mobile.
  • the UE 10 may be referred to as another terminology such as ⁇ mobile station (MS)', ⁇ user terminal (UT)', 'subscriber station (SS)', ⁇ mobile terminal (MT)', or ⁇ wireless device'.
  • the BS 20 may be a fixed station that communicates with the UE 10.
  • the BS 20 may be referred to as another terminology such as ⁇ evolved Node-B (eNB)', 'general Node-B (gNB)', ⁇ base transceiver system (BTS)', or ⁇ access point (AP)'.
  • the BSs 20 may be interconnected through an X2 interface.
  • the BS 20 may be connected to an evolved packet core (EPC) through an S1 interface. More particularly, the BS 20 may be connected to a mobility management entity (MME) through S1-MME and to a serving gateway (S-GW) through S1-U.
  • the EPC includes the MME, the S-GW, and a packet data network-gateway (P-GW).
  • Radio interface protocol layers between the UE and network may be classified into Layer 1 (L1), Layer 2 (L2), and Layer 3 (L3) based on three lower layers of the open system interconnection (OSI) model well known in communication systems.
  • a physical (PHY) layer which belongs to L1, provides an information transfer service over a physical channel.
  • a radio resource control (RRC) layer which belongs to L3, controls radio resources between the UE and network. To this end, the BS and UE may exchnage an RRC message through the RRC layer.
  • FIG. 2 illustrates an example of the 3GPP NR system architecture.
  • a NG-RAN includes gNBs, each of which provides a NG-RA user plane (e.g., new AS sublayer/PDCP/RLC/MAC/PHY) and a control plane (RRC) protocol terminal to a UE.
  • the gNBs are interconnected through an Xn interface.
  • the gNB is connected to an NGC through a NG interface. More particularly, the gNB is connected to an access and mobility management function through an N2 interface and to a user plane function (UPF) through an N3 interface.
  • UPF user plane function
  • Frame structure type 1 is applicable to both full-duplex FDD and half-duplex FDD.
  • the 20 slots are indexed from 0 to 19.
  • a subframe is composed of two consecutive slots. That is, subframe i is composed of slot 2i and slot (2i + 1).
  • 10 subframes may be used for DL transmission, and 10 subframes may be available for UL transmissions at every interval of 10 ms.
  • DL and UL transmissions are separated in the frequency domain. However, the UE may not perform transmission and reception simultaneously in the half-duplex FDD system.
  • FIG. 3 illustrates a radio frame structure of frame structure type 1.
  • the radio frame includes 10 subframes. Each subframe includes two slots in the time domain.
  • the time to transmit one subframe is defined as a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Since the 3GPP LTE system uses OFDMA in DL, the OFDM symbol may represent one symbol period. The OFDM symbol may be referred to as an SC-FDMA symbol or a symbol period.
  • a resource block (RB) is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.
  • This radio frame structure is merely exemplary. Therefore, the number of subframes in a radio frame, the number of slots in a subframe, or the number of OFDM symbols in a slot may be changed in various ways.
  • Frame structure type 2 is applicable to TDD.
  • D denotes a subframe reserved for DL transmission
  • U denotes a subframe reserved for UL transmission
  • S denotes a special subframe including the following three fields: downlink pilot time slot (DwPTS), guard period (GP), and uplink pilot time slot (UpPTS).
  • DwPTS may be referred to as a DL period
  • the UpPTS may be referred to as a UL period.
  • FIG. 4 illustrates a radio frame structure of frame structure type 2.
  • FIG. 4 shows that a UL-DL configuration supports DL-to-UL switch-point periodicities of 5 ms and 10 ms.
  • the special subframe exists across two half-frames.
  • the special subframe exists only in the first half-frame.
  • the DwPTS and subframe 0 and 5 are always reserved for DL transmission, and the UpPTS and a subframe next to the special subframe are always reserved for UL transmission.
  • FIG. 5 illustrates an example of a frame structure in NR.
  • the NR system may support various numerologies.
  • the numerology may be defined by subcarrier spacing and cyclic prefix (CP) overhead.
  • Multiple subcarrier spacing may be derived by scaling basic subcarrier spacing by an integer N (or ⁇ ).
  • N or ⁇
  • a numerology to be used may be selected independently from frequency bands.
  • various frame structures may be supported based on multiple numerologies.
  • Table 1 shows multiple OFDM numerologies supported in the NR system.
  • T s 1/( ⁇ f max ⁇ N f ).
  • T TA N TA T s than the start of a corresponding downlink frame of the UE.
  • T TA N TA T s than the start of a corresponding downlink frame of the UE.
  • T TA N TA T s than the start of a corresponding downlink frame of the UE.
  • slots are numbered in a subframe in the following ascending order: n s ⁇ ⁇ 0 , ... , N subframe slots , ⁇ ⁇ 1 and numbered in a frame in the following ascending order: n s , f ⁇ ⁇ 0 , ... , N frame slots ⁇ ⁇ 1 .
  • One slot is composed of N symb ⁇ consecutive OFDM symbols, and N symb ⁇ is determined by the current numerology and slot configuration.
  • n s ⁇ slots in a subframe are temporally aligned with those of n s ⁇ N symb ⁇ OFDM symbols in the same subframe.
  • Some UEs may not perform transmission and reception at the same time, and this means that some OFDM symbols in a downlink slot or an uplink slot are unavailable.
  • Table 2 shows the number of OFDM symbols per slot ( N symb slot ), the number of slots per radio frame ( N slot frame ⁇ ), and the number of slots per subframe ( N slot subframe ⁇ ) in the case of a normal CP
  • Table 3 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the case of an extended CP.
  • SCS subcarrier spacing
  • one subframe may include four slots.
  • a mini-slot may be composed of 2, 4, or 7 symbols.
  • the number of symbols included in the mini-slot may vary.
  • FIG. 6 illustrates a resource grid for one DL slot.
  • a downlink slot includes a plurality of OFDM symbols in the time domain.
  • One downlink slot includes 7 OFDM symbols in the time domain, and a resource block (RB) for example includes 12 subcarriers in the frequency domain.
  • RB resource block
  • Each element of the resource grid is referred to as a resource element (RE).
  • One RB includes 12 ⁇ 7 REs.
  • the number of RBs in the DL slot depends on a downlink transmission bandwidth.
  • An uplink slot may have the same structure as the downlink slot.
  • FIG. 7 illustrates the structure of a downlink subframe.
  • up to three OFDM symbols at the start of the first slot in a downlink subframe are used as a control region to which a control channel is allocated.
  • the remaining OFDM symbols are used as a data region to which a physical downlink shared channel (PDSCH) is allocated.
  • Downlink control channels used in the 3GPP LTE system include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), etc.
  • the PCFICH is transmitted in the first OFDM symbol in a subframe and carries information for the number of OFDM symbols used for transmitting a control channel.
  • the PHICH carries a hybrid automatic repeat request (HARQ) acknowledgement/negative-acknowledgement or not-acknowledgement (ACK/NACK) signal in response to uplink transmission.
  • Control information transmitted on the PDCCH is referred to as downlink control information (DCI).
  • DCI contains uplink or downlink scheduling information or an uplink transmission (Tx) power control command for a random UE group.
  • the PDCCH carries information for resource allocation for a downlink shared channel (DL-SCH), information for resource allocation for a uplink shared channel, paging information for a paging channel (PCH), and a DL-SCH voice over Internet protocol (VoIP) corresponding to resource allocation for a higher layer control message such as a random access response transmitted on the PDSCH, a set of Tx power control commands for individual UEs in a random UE group, a Tx power control command, activation of the Tx power control command, etc.
  • Multiple PDCCHs may be transmitted in the control region, and the UE may monitor the multiple PDCCHs.
  • the PDCCH may be transmitted on one control channel element (CCE) or aggregation of multiple consecutive CCEs.
  • CCE control channel element
  • the CCE is a logical allocation unit used to provide the PDCCH with a coding rate based on the state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • a PDCCH format and the number of available PDCCH bits are determined based on a relationship between the number of CCEs and the coding rate provided by the CCE.
  • the base station determines the PDCCH format depending on DCI to be transmitted to the UE and adds a cyclic redundancy check (CRC) to control information.
  • the CRC is masked with a unique identifier (e.g., radio network temporary identifier (RNTI)) according to the owner or usage of the PDCCH.
  • RNTI radio network temporary identifier
  • the CRC may be masked with a unique UE identifier (e.g., cell-RNTI). If the PDCCH is for a paging message, the CRC may be masked with a paging indication identifier (e.g., paging-RNTI (P-RNTI)). If the PDCCH is for system information (more specifically, for a system information block (SIB)), the CRC may be masked with a system information identifier and a system information RNTI (SI-RNTI). Further, the CRC may be masked with a random access-RNTI (RA-RNTI) to indicate a random access response in response to transmission of a random access preamble of the UE.
  • a unique UE identifier e.g., cell-RNTI
  • a paging indication identifier e.g., paging-RNTI (P-RNTI)
  • SIB system information block
  • SI-RNTI system information RNTI
  • FIG. 8 illustrates the structure of an uplink subframe.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) for carrying uplink control information may be allocated to the control region, and a physical uplink shared channel (PUSCH) for carrying user data may be allocated to the data region.
  • the UE may not transmit the PUCCH and the PUSCH at the same time to maintain single-carrier characteristics.
  • the PUCCH for the UE is allocated to an RB pair in a subframe.
  • the RBs included in the RB pair occupy different subcarriers in two slots. In other words, the RB pair allocated for the PUCCH may be frequency-hopped at a slot boundary.
  • an antenna port may be defined such that a channel carrying a symbol on the antenna port is inferred from a channel carrying another symbol on the same antenna port.
  • the two antenna ports may be said to be in quasi co-located or quasi co-location (QC/QCL) relationship.
  • the large-scale properties may include at least one of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 9 illustrates an example of a resource grid in NR.
  • N RB ⁇ N sc RB subcarriers there are N RB ⁇ N sc RB subcarriers in the frequency domain, and there are 14 ⁇ 2 ⁇ OFDM symbols in one subframe.
  • the resource grid is merely exemplary and the present disclosure is not limited thereto.
  • a transmitted signal is described by one or more resource grids, each including N RB ⁇ N sc RB subcarriers, and 2 ⁇ N symb ⁇ OFDM symbols.
  • N RB max , ⁇ denotes the maximum transmission bandwidth and may change not only between numerologies but also between uplink and downlnk. As shown in FIG.
  • one resource grid may be configured for each numerology ⁇ and antenna port p.
  • the resource element ( k , l ) for the numerology ⁇ and antenna port p corresponds to a complex value a k , l ⁇ p ⁇ .
  • the indexes p and ⁇ may be dropped, and as a result, the complex value may be a k , l ⁇ p or a k, l .
  • Point A serves as a common reference point for resource block grids and may be obtained as follows.
  • Common resource blocks are numbered from 0 upwards in the frequency domain for SCS configuration ⁇ .
  • the center of subcarrier 0 of common resource block 0 for the SCS configuration ⁇ is equivalent to point A.
  • Equation 1 The relation between a common RB number n CRB ⁇ in the frequency domain and a resource element (k,l) for the SCS configuration ⁇ is determined as shown in Equation 1.
  • n CRB ⁇ ⁇ k N sc RB ⁇
  • Physical resource blocks are defined within a bandwidth part (BWP) and numbered from 0 to N BWP , i size ⁇ 1 , where i denotes the number of the BWP.
  • BWP bandwidth part
  • n PRB n PRB + N BWP , i start
  • N BWP , i start is a common resource block where the BWP starts relative to common resource block 0.
  • FIG. 10 illustrates an example of a physical resource block in NR.
  • FIG. 11 illustrates a block diagram of a wireless communication apparatus to which the methods proposed in the present disclosure are applicable.
  • a wireless communication system includes a base station 1110 and multiple UEs 1120 located within coverage of the base station 1110.
  • the base station 1110 and the UE may be referred to as a transmitter and a receiver, respectively, and vice versa.
  • the base station 1110 includes a processor 1111, a memory 1114, at least one transmission/reception (Tx/Rx) radio frequency (RF) module (or RF transceiver) 1115, a Tx processor 1112, an Rx processor 1113, and an antenna 1116.
  • Tx/Rx transmission/reception
  • RF radio frequency
  • the UE 1120 includes a processor 1121, a memory 1124, at least one Tx/Rx RF module (or RF transceiver) 1125, a Tx processor 1122, an Rx processor 1123, and an antenna 1126.
  • the processors are configured to implement the above-described functions, processes and/or methods.
  • the processor 1111 provides a higher layer packet from a core network for downlink (DL) transmission (communication from the base station to the UE).
  • the processor implements the functionality of layer 2 (L2).
  • L2 layer 2
  • the processor provides the UE 1120 with multiplexing between logical and transmission channels and radio resource allocation. That is, the processor is in charge of signaling to the UE.
  • the Tx processor 1112 implements various signal processing functions of layer 1 (L1) (i.e., physical layers).
  • the signal processing functions include facilitating the UE to perform forward error correction (FEC) and performing coding and interleaving.
  • Coded and modulated symbols may be divided into parallel streams.
  • Each stream may be mapped to an OFDM subcarrier, multiplexed with a reference signal (RS) in the time and/or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to create a physical channel carrying a time domain OFDMA symbol stream.
  • RS reference signal
  • IFFT inverse fast Fourier transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Each spatial stream may be provided to a different antenna 1116 through the Tx/Rx module (or transceiver) 1115.
  • Each Tx/Rx module may modulate an RF carrier with each spatial stream for transmission.
  • each Tx/Rx module (or transceiver) 1125 receives a signal through each antenna 1126 thereof.
  • Each Tx/Rx module recovers information modulated on the RF carrier and provides the information to the RX processor 1123.
  • the Rx processor implements various signal processing functions of layer 1.
  • the Rx processor may perform spatial processing on the information to recover any spatial streams toward the UE. If multiple spatial streams are destined for the UE, the multiple spatial streams may be combined by multiple Rx processors into a single OFDMA symbol stream.
  • the RX processor converts the OFDMA symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT).
  • FFT fast Fourier transform
  • a frequency-domain signal includes a separate OFDMA symbol stream for each subcarrier of an OFDM signal.
  • the symbols and the reference signal on each subcarrier are recovered and demodulated by determining the most probable signal constellation points transmitted by the base station. Such soft decisions may be based on channel estimation values.
  • the soft decisions are decoded and deinterleaved to recover data and control signals originally transmitted by the base stationover the physical channel.
  • the corresponding data and control signals are provided to the processor 1121.
  • Uplink (UL) transmission (communication from the UE to the base station) is processed by the base station1110 in a similar way to that described in regard to the receiver functions of the UE 1120.
  • Each Tx/Rx module (or transceiver) 1125 receives a signal through each antenna 1126.
  • Each Tx/Rx module provides an RF carrier and information to the Rx processor 1123.
  • the processor 1121 may be connected to the memory 1124 storing program codes and data.
  • the memory may be referred to as a computer-readable medium.
  • the Machine Type Communication refers to communication technology adopted by 3 rd Generation Partnership Project (3GPP) to meet Internet of Things (IoT) service requirements. Since the MTC does not require high throughput, it may be used as an application for machine-to-machine (M2M) and Internet of Things (IoT).
  • 3GPP 3 rd Generation Partnership Project
  • IoT Internet of Things
  • the MTC may be implemented to satisfy the following requirements: (i) low cost and low complexity; (ii) enhanced coverage; and (iii) low power consumption.
  • the MTC was introduced in 3GPP release 10.
  • the MTC features added in each 3GPP release will be described.
  • the MTC load control was introduced in 3GPP releases 10 and 11.
  • the load control method prevents IoT (or M2M) devices from creating a heavy load on the base station suddenly.
  • the base station may disconnect connections with IoT devices to control the load.
  • the base station may prevent the UE from attempting to establish a connection by informing the UE that access will become available through broadcasting such as SIB 14.
  • the UE category indicates the amount of data that the UE is capable of processing using a communication modem.
  • a UE that belongs to UE category 0 may use a reduced peak data rate, a half-duplex operation with relaxed RF requirements, and a single reception antenna, thereby reducing the baseband and RF complexity of the UE.
  • enhanced MTC enhanced MTC
  • the UE operates in a bandwidth of 1.08 MHz, which is the minimum frequency bandwidth supported by legacy LTE, thereby further reducing the cost and power consumption.
  • the MTC may be referred to as another terminology such as ⁇ eMTC', ⁇ LTE-M1/M2', ⁇ bandwidth reduced low complexity/coverage enhanced (BL/CE)', ⁇ non-BL UE (in enhanced coverage)', ⁇ NR MTC', or ⁇ enhanced BL/CE'.
  • MTC may be replaced with a term defined in the future 3GPP standards.
  • the MTC operates only in a specific system bandwidth (or channel bandwidth).
  • the specific system bandwidth may use 6 RBs of the legacy LTE as shown in Table 4 below and defined by considering the frequency range and subcarrier spacing (SCS) shown in Tables 5 to 7.
  • the specific system bandwidth may be referred to as narrowband (NB).
  • the legacy LTE may encompass the contents described in the 3GPP standards expect the MTC.
  • the MTC may use RBs corresponding the smallest system bandwidth in Tables 6 and 7 as in the legacy LTE.
  • the MTC may operate in at least one BWP or in a specific band of a BWP.
  • Channel bandwidth BWChannel [MHz] 1.4 3 5 10 15 20 Transmission bandwidth configuration 6 15 25 50 75 100
  • Table 5 shows the frequency ranges (FRs) defined for the NR.
  • FRs frequency ranges
  • Table 5 Frequency range designation
  • Table 6 shows the maximum transmission bandwidth configuration (NRB) for the channel bandwidth and SCS in NR FR1.
  • SCS (kHz) 5MHz 10MHz 15MHz 20 MHz 25 MHz 30 MHz 40 MHz 50MHz 60 MHz 80 MHz 90 MHz 100 MHz NRB NRB NRB NRB NRB NRB NRB NRB NRB NRB NRB 15 25 52 79 106 133 160 216 270 N/A N/A N/A N/A 30 11 24 38 51 65 78 106 133 162 217 245 273 60 N/A 11 18 24 31 38 51 65 79 107 121 135
  • Table 7 shows the maximum transmission bandwidth configuration (NRB) for the channel bandwidth and SCS in NR FR2.
  • SCS (kHz) 50MHz 100MHz 200MHz 400 MHz NRB NRB NRB NRB 60 66 132 264 N.A 120 32 66 132 264
  • the MTC follows narrowband operation to transmit and receive physical channels and signals, and the maximum channel bandwidth is reduced to 1.08 MHz or 6 (LTE) RBs.
  • the narrowband may be used as a reference unit for allocating resources to some downlink and uplink channels, and the physical location of each narrowband in the frequency domain may vary depending on the system bandwidth.
  • the 1.08 MHz bandwidth for the MTC is defined to allow an MTC UE to follow the same cell search and random access procedures as those of the legacy UE.
  • the MTC may be supported by a cell with a much larger bandwidth (e.g., 10 MHz), but the physical channels and signals transmitted/received in the MTC are always limited to 1.08 MHz.
  • the larger bandwidth may be supported by the legacy LTE system, NR system, 5G system, etc.
  • the narrowband is defined as 6 non-overlapping consecutive physical RBs in the frequency domain.
  • FIG. 12 illustrates examples of narrowband operations and frequency diversity.
  • FIG. 12 (a) illustrates an example of the narrowband operation
  • FIG. 12(b) illustrates an example of repetitions with RF retuning.
  • the MTC supports limited frequency, spatial, and time diversity due to the narrowband RF, single antenna, and limited mobility. To reduce the effects of fading and outages, frequency hopping is supported between different narrowbands by the RF retuning.
  • the frequency hopping is applied to different uplink and downlink physical channels when repetition is enabled.
  • the first 16 subframes may be transmitted on the first narrowband.
  • the RF front-end is retuned to another narrowband, and the remaining 16 subframes are transmitted on the second narrowband.
  • the MTC narrowband may be configured by system information or DCI.
  • the MTC operates in half-duplex mode and uses limited (or reduced) maximum transmission power.
  • the MTC does not use a channel (defined in the legacy LTE or NR) that should be distributed over the full system bandwidth of the legacy LTE or NR.
  • the MTC does not use the following legacy LTE channels: PCFICH, PHICH, and PDCCH.
  • an MTC PDCCH (MPDCCH)
  • MPDCCH MTC PDCCH
  • the MPDCCH may occupy a maximum of 6 RBs in the frequency domain and one subframe in the time domain.
  • the MPDCCH is similar to an evolved PDCCH (EPDCCH) and supports a common search space for paging and random access.
  • EPDCCH evolved PDCCH
  • the concept of the MPDCCH is similar to that of the EPDCCH used in the legacy LTE.
  • the MTC uses newly defined DCI formats.
  • DCI formats 6-0A, 6-0B, 6-1A, 6-1B, 6-2, etc. may be used.
  • a physical broadcast channel (PBCH), physical random access channel (PRACH), MPDCCH, PDSCH, PUCCH, and PUSCH may be repeatedly transmitted.
  • the MTC repeated transmission enables decoding of an MTC channel in a poor environment such as a basement, that is, when the signal quality or power is low, thereby increasing the radius of a cell or supporting the signal propagation effect.
  • the MTC may support a limited number of transmission modes (TMs), which are capable of operating on a single layer (or single antenna), or support a channel or reference signal (RS), which are capable of operating on a single layer.
  • TMs transmission modes
  • RS channel or reference signal
  • the MTC may operate in TM 1, 2, 6, or 9.
  • HARQ retransmission is adaptive and asynchronous and performed based on a new scheduling assignment received on the MPDCCH.
  • PDSCH scheduling (DCI) and PDSCH transmission occur in different subframes (cross-subframe scheduling).
  • All resource allocation information (e.g., a subframe, a transport block size (TBS), a subband index, etc.) for SIB1 decoding is determined by a master information block (MIB) parameter (in the MTC, no control channel is used for the SIB 1 decoding).
  • MIB master information block
  • All resource allocation information (e.g., a subframe, a TBS, a subband index, etc.) for SIB2 decoding is determined by several SIB1 parameters (in the MTC, no control channel is used for the SIB2 decoding).
  • the MTC supports an extended discontinuous reception (DRX) cycle.
  • DRX discontinuous reception
  • the MTC may use the same primary synchronization signal/secondary synchronization signal/common reference signal (PSS/SSS/CRS) as that used in the legacy LTE or NR.
  • PSS/SSS/CRS primary synchronization signal/secondary synchronization signal/common reference signal
  • the PSS/SSS is transmitted in the unit of SS block (or SS/PBCH block or SSB), and a tracking RS (TRS) may be used for the same purpose as the CRS. That is, the TRS is a cell-specific RS and may be used for frequency/time tracking.
  • MTC operation modes and levels will be described.
  • the MTC may be divided into two operation modes (first and second modes) and four different levels as shown in Table 8 below.
  • the MTC operation mode may be referred to CE mode.
  • the first and second modes may be referred to CE mode A and CE mode B, respectively.
  • the first mode is defined for small coverage where full mobility and channel state information (CSI) feedback are supported. In the first mode, the number of repetitions is zero or small. The operation in the first mode may have the same operation coverage as that of UE category 1.
  • the second mode is defined for a UE with a very poor coverage condition where CSI feedback and limited mobility are supported. In the second mode, the number of times that transmission is repeated is large. The second mode provides up to 15 dB coverage enhancement with reference to the coverage of UE category 1.
  • Each level of the MTC is defined differently in RACH and paging procedures.
  • the MTC operation mode is determined by the base station, and each level is determined by the MTC UE. Specifically, the base station transmits RRC signaling including information for the MTC operation mode to the UE.
  • the RRC signaling may include an RRC connection setup message, an RRC connection reconfiguration message, or an RRC connection reestablishment message.
  • the term “message” may refer to an information element (IE).
  • the MTC UE determines a level within the operation mode and transmits the determined level to the base station. Specifically, the MTC UE determines the level within the operation mode based on measured channel quality (e.g., RSRP, RSRQ, SINR, etc.) and informs the base station of the determined level using a PRACH resource (e.g., frequency, time, preamble, etc.).
  • measured channel quality e.g., RSRP, RSRQ, SINR, etc.
  • a PRACH resource e.g., frequency, time, preamble, etc.
  • the MTC operates in the narrowband.
  • the location of the narrowband may vary in each specific time unit (e.g., subframe or slot).
  • the MTC UE tunes to a different frequency in every time unit.
  • all frequency retuning may require a certain period of time.
  • the guard period is required for transition from one time unit to the next time unit, and no transmission and reception occurs during the corresponding period.
  • the guard period varies depending on whether the current link is downlink or uplink and also varies depending on the state thereof.
  • An uplink guard period i.e., guard period defined for uplink
  • a first downlink narrowband center frequency is different from a second narrowband center frequency
  • a first uplink narrowband center frequency is different from a second downlink center frequency.
  • the MTC guard period defined in the legacy LTE will be described.
  • a guard period consisting of at most N symb retune SC-FDMA symbols is created for Tx-Tx frequency retuning between two consecutive subframes.
  • N symb retune is equal to ce-RetuningSymbols. Otherwise, N symb retune is 2.
  • a guard period consisting of SC-FDMA symbols is created for Tx-Tx frequency retuning between a first special subframe and a second uplink subframe for frame structure type 2.
  • FIG. 13 illustrates physical channels available in MTC and a general signal transmission method using the same.
  • the MTC UE When an MTC UE is powered on or enters a new cell, the MTC UE performs initial cell search in step S1301.
  • the initial cell search involves acquisition of synchronization with a base station. Specifically, the MTC UE synchronizes with the base station by receiving a primary synchronization signal (PSS) and a second synchronization signal (SSS) from the base station and obtains information such as a cell identifier (ID).
  • PSS/SSS used by the MTC UE for the initial cell search may be equal to a PSS/SSS or a resynchronization signal (RSS) of the legacy LTE.
  • the MTC UE may acquire broadcast information in the cell by receiving a PBCH signal from the base station.
  • the MTC UE may monitor the state of a downlink channel by receiving a downlink reference signal (DL RS).
  • DL RS downlink reference signal
  • the broadcast information transmitted on the PBCH corresponds to the MIB.
  • the MIB is repeated in the first slot of subframe #0 of a radio frame and other subframes (subframe #9 in FDD and subframe #5 in the TDD).
  • the PBCH repetition is performed such that the same constellation point is repeated on different OFDM symbols to estimate an initial frequency error before attempting PBCH decoding.
  • FIG. 14 illustrates an example of system information transmissions in MTC.
  • FIG. 14 (a) illustrates an example of a repetition pattern for subframe #0 in FDD and a frequency error estimation method for a normal CP and repeated symbols
  • FIG. 14 (b) illustrates an example of transmission of an SIB-BR on a wideband LTE channel.
  • SIB1-BR bandwidth reduced device
  • the SIB-BR is transmitted on a PDSCH directly without any related control channels.
  • the SIB-BR is maintained without change for 512 radio frames (5120 ms) to allow a large number of subframes to be combined.
  • Table 9 shows an example of the MIB.
  • the schedulingInfoSIB1-BR field indicates the index of a table that defines SystemInformationBlockTypel-BR scheduling information.
  • the zero value means that SystemlnformationBlockType1-BR is not scheduled.
  • the overall function and information carried by SystemInformationBlockType1-BR (or SIB1-BR) is similar to SIB1 of the legacy LTE.
  • the contents of SIB1-BR may be categorized as follows: (1) PLMN; (2) cell selection criteria; and (3) scheduling information for SIB2 and other SIBs.
  • the MTC UE may acquire more detailed system information by receiving a MPDCCH and a PDSCH based on information in the MPDCCH in step S1302.
  • the MPDCCH has the following features: (1) The MPDCCH is very similar to the EPDCCH; (2) The MPDCCH may be transmitted once or repeatedly (the number of repetitions is configured through higher layer signaling); (3) Multiple MPDCCHs are supported and a set of MPDCCHs are monitored by the UE; (4) the MPDCCH is generated by combining enhanced control channel elements (eCCEs), and each CCE includes a set of REs; and (5) the MPDCCH supports an RA-RNTI, SI-RNTI, P-RNTI, C-RNTI, temporary C-RNTI, and semi-persistent scheduling (SPS) C-RNTI.
  • SPS semi-persistent scheduling
  • SIB2 includes parameters related to paging.
  • a paging occasion (PO) is a subframe in which the P-RNTI is capable of being transmitted on the MPDCCH.
  • the PO may refer to a subframe where MPDCCH repetition is started.
  • a paging frame (PF) is one radio frame, which may contain one or multiple POs.
  • DRX is used, the MTC UE monitors one PO per DRX cycle.
  • a paging narrowband (PNB) is one narrowband, on which the MTC UE performs paging message reception.
  • the MTC UE may transmit a preamble on a PRACH (S1303) and receive a response message (e.g., random access response (RAR)) for the preamble on the MPDCCH and the PDSCH related thereto (S1304).
  • a response message e.g., random access response (RAR)
  • the MTC UE may perform a contention resolution procedure including transmission of an additional PRACH signal (S 1305) and reception of a MPDCCH signal and a PDSCH signal related thereto (S1306).
  • the signals and messages (e.g., Msg 1, Msg 2, Msg 3, and Msg 4) transmitted during the RACH procedure may be repeatedly transmitted, and a repetition pattern may be configured differently depending on coverage enhancement (CE) levels.
  • Msg 1 may represent the PRACH preamble
  • Msg 2 may represent the RAR
  • Msg 3 may represent uplink transmission for the RAR at the MTC UE
  • Msg 4 may represent downlink transmission for Msg 3
  • PRACH resource For random access, signaling of different PRACH resources and different CE levels is supported. This provides the same control of the near-far effect for the PRACH by grouping UEs that experience similar path loss together. Up to four different PRACH resources may be signaled to the MTC UE.
  • the MTC UE measures RSRP using a downlink RS (e.g., CRS, CSI-RS, TRS, etc.) and selects one of random access resources based on the measurement result.
  • a downlink RS e.g., CRS, CSI-RS, TRS, etc.
  • Each of four random access resources has an associated number of PRACH repetitions and an associated number of RAR repetitions.
  • the MTC UE in poor coverage requires a large number of repetitions so as to be detected by the base station successfully and needs to receive as many RARs as the number of repetitions such that the coverage levels thereof are satisfied.
  • the search spaces for RAR and contention resolution messages are defined in the system information, and the search space is independent for each coverage level.
  • a PRACH waveform used in the MTC is the same as that in the legacy LTE (for example, OFDM and Zadoff-Chu sequences).
  • the MTC UE may perform reception of an MPDCCH signal and/or a PDSCH signal (S1307) and transmission of a PUSCH signal and/or a PUCCH signal (S1308) as a normal uplink/downlink signal transmission procedure.
  • Control information that the MTC UE transmits to the base station is commonly referred to as uplink control information (UCI).
  • the UCI includes a HARQ-ACK/NACK, scheduling request, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc.
  • the MTC UE When the MTC UE has established an RRC connection, the MTC UE blindly decodes the MPDCCH in a configured search space to obtain uplink and downlink data assignments.
  • the MTC In the MTC, all available OFDM symbols in a subframe are used to transmit DCI. Accordingly, time-domain multiplexing is not allowed between control and data channels in the subframe. Thus, the cross-subframe scheduling may be performed between the control and data channels as described above.
  • the MPDCCH schedules a PDSCH assignment in subframe #N+2.
  • DCI carried by the MPDCCH provides information for how many times the MPDCCH is repeated so that the MTC UE may know the number of repetitions when PDSCH transmission is started.
  • the PDSCH assignment may be performed on different narrowbands.
  • the MTC UE may need to perform retuning before decoding the PDSCH assignment.
  • scheduling follows the same timing as that of the legacy LTE.
  • the last MPDCCH in subframe #N schedules PUSCH transmission starting in subframe #N + 4.
  • FIG. 15 illustrates an example of scheduling for each of MTC and legacy LTE.
  • a legacy LTE assignment is scheduled using the PDCCH and uses the initial OFDM symbols in each subframe.
  • the PDSCH is scheduled in the same subframe in which the PDCCH is received.
  • the MTC PDSCH is cross-subframe scheduled, and one subframe is defined between the MPDCCH and PDSCH to allow MPDCCH decoding and RF retuning.
  • MTC control and data channels may be repeated for a large number of subframes to be decoded in an extreme coverage condition. Specifically, the MTC control and data channels may be repeated for a maximum of 256 subframes for the MPDCCH and a maximum of 2048 subframes for the PDSCH
  • Narrowband-Internet of Things (NB-IoT)
  • the NB-IoT may refer to a system for providing low complexity and low power consumption based on a system bandwidth (BW) corresponding to one physical resource block (PRB) of a wireless communication system (e.g., LTE system, NR system, etc.).
  • BW system bandwidth
  • PRB physical resource block
  • the NB-IoT may be referred to as another terminology such as ⁇ NB-LTE', ⁇ NB-IoT enhancement', 'further enhanced NB-IoT', or 'NB-NR'.
  • the NB-IoT may be replaced with a term defined or to be defined in the 3GPP standards. For convenience of description, all types of NB-IoT is commonly referred to as 'NB-IoT'.
  • the NB-IoT may be used to implement the IoT by supporting an MTC device (or MTC UE) in a cellular system. Since one PRB of the system BW is allocated for the NB-IoT, frequency may be efficiently used. In addition, considering that in the NB-IoT, each UE recognizes a single PRB as one carrier, the PRB and carrier described herein may be considered to have the same meaning.
  • the present disclosure describes frame structures, physical channels, multi-carrier operation, operation modes, and general signal transmission and reception of the NB-IoT based on the LTE system, it is apparent that the present disclosure is applicable to the next-generation systems (e.g., NR system, etc.).
  • the details of the NB-IoT described in the present disclosure may be applied to the MTC, which has similar purposes (e.g., low power, low cost, coverage enhancement, etc.).
  • the NB-IoT frame structure may vary depending on subcarrier spacing.
  • FIGS. 16 and 17 illustrate examples of NB-IoT frame structures according to subcarrier spacing (SCS). Specifically, FIG. 16 illustrates a frame structure with SCS of 15 kHz, and FIG. 17 illustrates a frame structure with SCS of 3.75 kHz.
  • SCS subcarrier spacing
  • FIG. 16 illustrates a frame structure with SCS of 15 kHz
  • FIG. 17 illustrates a frame structure with SCS of 3.75 kHz.
  • the NB-IoT frame structure is not limited thereto, and different SCS (e.g., 30 kHz, etc.) may be applied to the NB-IoT by changing the time/frequency unit.
  • the present disclosure describes the NB-IoT frame structure based on the LTE frame structure, this is merely for convenience of description and the present disclosure is not limited thereto. That is, the embodiments of the present disclosure are applicable to the NB-IoT based on the frame structure of the next-generation system (e.g., NR system).
  • the next-generation system e.g., NR system
  • the NB-IoT frame structure for the 15 kHz subcarrier spacing is the same as the frame structure of the legacy system (LTE system).
  • a 10 ms NB-IoT frame may include 10 NB-IoT subframes of 1 ms each, and the 1 ms NB-IoT subframe may include two NB-IoT slots, each having a duration of 0.5 ms.
  • Each 0.5 ms NB-IoT slot ms may include 7 OFDM symbols.
  • a 10 ms NB-IoT frame may include five NB-IoT subframes of 2 ms each, and the 2 ms NB-IoT subframe may include 7 OFDM symbols and one guard period (GP).
  • the 2 ms NB-IoT subframe may be expressed as an NB-IoT slot or an NB-IoT resource unit (RU).
  • the NB-IoT downlink physical resource may be configured by limiting the resource grid of the LTE system illustrated in FIG. 6 to one RB (i.e., one PRB) in the frequency domain.
  • the NB-IoT uplink physical resource may be configured by limiting to the system bandwidth to one RB as in the NB-IoT downlink.
  • a resource grid for the NB-IoT uplink may be represented as shown in FIG. 18 .
  • the number of subcarriers N sc UL and the slot period T slot may be given in Table 10 below.
  • FIG. 18 illustrates an example of the resource grid for NB-IoT uplink.
  • a resource unit (RU) for the NB-IoT uplink may include SC-FDMA symbols in the time domain and N symb UL N slots UL consecutive subcarriers in the frequency domain.
  • N sc RU and N symb UL may be given in Table 11 below.
  • N sc RU and N symb UL may be given in Table 12.
  • NPUSCH format ⁇ f N sc RU N slots UL N symb UL 1 3.75 kHz 1 16 7 15 kHz 1 16 3 8 6 4 12 2 2 3.75 kHz 1 4 15 kHz 1 4
  • NPUSCH format ⁇ f Supported uplink-downlink configurations N sc RU N slots UL N symb UL 1 3.75 kHz 1, 4 1 16 1 15 kHz 1, 2, 3, 4, 5 1 16 3 8 6 4 12 2 2 3.75 kHz 1, 4 1 4 15 kHz 1, 2, 3, 4, 5 1 4
  • a base station and/or UE that support the NB-IoT may be configured to transmit and receive physical channels and signals different from those in the legacy system.
  • the physical channels and/or signals supported in the NB-IoT will be described in detail.
  • the NB-IoT downlink will be described.
  • an OFDMA scheme with the 15 kHz subcarrier spacing may be applied. Accordingly, orthogonality between subcarriers may be provided, thereby supporting coexistence with the legacy system (e.g., LTE system, NR system, etc.).
  • the legacy system e.g., LTE system, NR system, etc.
  • ⁇ N (narrowband)' may be added.
  • DL physical channels may be defined as follows: 'narrowband physical broadcast channel (NPBCH)', ⁇ narrowband physical downlink control channel (NPDCCH)', 'narrowband physical downlink shared channel (NPDSCH)', etc.
  • DL physical signals may be defined as follows: 'narrowband primary synchronization signal (NPSS)', ⁇ narrowband secondary synchronization signal (NSSS)', 'narrowband reference signal (NRS)', ⁇ narrowband positioning reference signal (NPRS)', ⁇ narrowband wake-up signal (NWUS)', etc.
  • the above-described downlink physical channels and physical signals for the NB-IoT may be configured to be transmitted based on time-domain multiplexing and/or frequency-domain multiplexing.
  • the NPBCH, NPDCCH, and NPDSCH which are downlink channels of the NB-IoT system, may be repeatedly transmitted for coverage enhancement.
  • the NB-IoT uses newly defined DCI formats.
  • the DCI formats for the NB-IoT may be defined as follows: DCI format N0, DCI format N1, DCI format N2, etc.
  • the NB-IoT uplink may support multi-tone and single-tone transmissions.
  • the multi-tone transmission may support the 15 kHz subcarrier spacing
  • the single-tone transmission may support both the 15 kHz and 3.75 kHz subcarrier spacing.
  • ⁇ N (narrowband)' may also be added to distinguish the physical channels of the NB-IoT system from those of the legacy system, similarly to the NB-IoT downlink.
  • uplink physical channels may be defined as follows: ⁇ narrowband physical random access channel (NPRACH)', ⁇ narrowband physical uplink shared channel (NPUSCH)', etc.
  • UL physical signals may be defined as follows: ⁇ narrowband demodulation reference signal (NDMRS)'.
  • the NPUSCH may be configured with NPUSCH format 1 and NPUSCH format 2.
  • NPUSCH format 1 is used for UL-SCH transmission (or transfer)
  • NPUSCH format 2 may be used for UCI transmission such as HARQ ACK signaling.
  • the NPRACH which is a downlink channel of the NB-IoT system, may be repeatedly transmitted for coverage enhancement.
  • frequency hopping may be applied to the repeated transmission.
  • the multi-carrier operation in the NB-IoT may mean that when the base station and/or UE uses different usage of multiple carriers (i.e., different types of multiple carriers) in transmitting and receiving a channel and/or a signal in the NB-IoT.
  • multiple carriers i.e., different types of multiple carriers
  • NB-IoT may operate in multi-carrier mode as described above.
  • NB-IoT carriers may be divided into an anchor type carrier (i.e., anchor carrier or anchor PRB) and a non-anchor type carrier (i.e., non-anchor carrier or non-anchor PRB).
  • anchor type carrier i.e., anchor carrier or anchor PRB
  • non-anchor type carrier i.e., non-anchor carrier or non-anchor PRB
  • the anchor carrier may mean a carrier for transmitting the NPDSCH that carries the NPSS, NSSS, NPBCH, and SIB (N-SIB) for initial access.
  • the carrier for initial access may be referred to as the anchor carrier, and the remaining carrier(s) may be referred to as the non-anchor carrier.
  • the operation mode of the NB-IoT will be described.
  • the NB-IoT system may support three operation modes.
  • FIG. 19 illustrates an examples of operation modes supported in the NB-IoT system.
  • the present disclosure describes the NB-IoT operation mode based on the LTE band, this is merely for convenience of description and the present disclosure is also applicable to other system bands (e.g., NR system band).
  • FIG. 19 (a) illustrates an in-band system
  • FIG. 19 (b) illustrates a guard-band system
  • FIG. 19 (c) illustrates a stand-alone system.
  • the in-band system, guard-band system, and stand-alone system may be referred to as in-band mode, guard-band mode, and stand-alone mode, respectively.
  • the in-band system may mean a system or mode that uses one specific RB (PRB) in the legacy LTE band for the NB-IoT.
  • PRB specific RB
  • the guard-band system may mean a system or mode that uses a space reserved for the guard band of the legacy LTE band for the NB-IoT.
  • the guard band of the LTE carrier which is not used as the RB in the LTE system may be allocated.
  • the legacy LTE band may be configured such that each LTE band has the guard band of minimum 100 kHz at the end thereof. In order to use 200 kHz, two non-contiguous guard bands may be used.
  • the in-band system and the guard-band system may operate in a structure where the NB-IoT coexists in the legacy LTE band.
  • the stand-alone system may mean a system or mode independent from the legacy LTE band.
  • a frequency band e.g., reallocated GSM carrier
  • GERAN GSM EDGE radio access network
  • the above three operation modes may be applied independently, or two or more operation modes may be combined and applied.
  • FIG. 20 illustrates an example of physical channels available in the NB-IoT and a general signal transmission method using the same.
  • an NB-IoT UE may receive information from a base station in downlink (DL) and transmit information to the base station in uplink (UL).
  • the base station may transmit the information to the NB-IoT UE in downlink and receive the information from the NB-IoT UE in uplink in the wireless communication system.
  • Information transmitted and received between the base station and the NB-IoT UE may include various data and control information, and various physical channels may be used depending on the type/usage of information transmitted and received therebetween.
  • the NB-IoT signal transmission and reception method described with reference to FIG. 20 may be performed by the aforementioned wireless communication apparatuses (e.g., base station and UE in FIG. 11 ).
  • the NB-IoT UE may perform initial cell search (S11).
  • the initial cell search involves acquisition of synchronization with the base station.
  • the NB-IoT UE may synchronize with the base station by receiving an NPSS and an NSSS from the base station and obtain information such as a cell ID. Thereafter, the NB-IoT UE may acquire information broadcast in the cell by receiving an NPBCH from the base station.
  • the NB-IoT UE may monitor the state of a downlink channel by receiving a downlink reference signal (DL RS).
  • DL RS downlink reference signal
  • the BS may perform the initial cell search, and more particularly, the base station may synchronize with the UE. Specifically, the base station may synchronize with the NB-IoT UE by transmitting the NPSS and NSSS to the UE and transmit the information such as the cell ID. The base station may transmit the broadcast information in the cell by transmitting (or broadcasting) the NPBCH to the NB-IoT UE. The BS may transmit the DL RS to the NB-IoT UE during the initial cell search to check the downlink channel state.
  • the NB-IoT UE may acquire more detailed system information by receiving a NPDCCH and a NPDSCH related to thereto (S12).
  • the base station may transmit the more detailed system information by transmitting the NPDCCH and the NPDSCH related to thereto to the NB-IoT UE.
  • the NB-IoT UE may perform a random access procedure to complete the access to the base station (S13 to S16).
  • the NB-IoT UE may transmit a preamble on an NPRACH (S13).
  • the NPRACH may be repeatedly transmitted based on frequency hopping for coverage enhancement.
  • the base station may (repeatedly) receive the preamble from the NB-IoT UE over the NPRACH.
  • the NB-IoT UE may receive a random access response (RAR) for the preamble from the base station on the NPDCCH and the NPDSCH related thereto (S14). That is, the base station may transmit the random access response (RAR) for the preamble to the base station on the NPDCCH and the NPDSCH related thereto.
  • RAR random access response
  • the NB-IoT UE may transmit an NPUSCH using scheduling information in the RAR (S15) and perform a contention resolution procedure based on the NPDCCH and the NPDSCH related thereto (S16). That is, the base station may receive the NPUSCH from the NB-IoT UE based on the scheduling information in the RAR and perform the contention resolution procedure.
  • the NB-IoT UE may perform NPDCCH/NPDSCH reception (S17) and NPUSCH transmission (S18) as a normal UL/DL signal transmission procedure.
  • the base station may transmit the NPDCCH/NPDSCH to the NB-IoT UE and receive the NPUSCH from the NB-IoT UE during the normal uplink/downlink signal transmission procedure.
  • the NPBCH, NPDCCH, NPDSCH, etc. may be repeatedly transmitted for the coverage enhancement as described above.
  • UL-SCH (normal uplink data) and UCI may be transmitted on the NPUSCH.
  • the UL-SCH and UCI may be configured to be transmitted in different NPUSCH formats (e.g., NPUSCH format 1, NPUSCH format 2, etc.)
  • the UCI means control information transmitted from the UE to the base station.
  • the UCI may include the HARQ ACK/NACK, scheduling request (SR), CSI, etc.
  • the CSI may include the CQI, PMI, RI, etc.
  • the UCI may be transmitted over the NPUSCH in the NB-IoT as described above.
  • the UE may transmit the UCI on the NPUSCH periodically, aperiodically, or semi-persistently according to the request/indication from the network (e.g., base station).
  • the procedure in which the NB-IoT UE initially accesses the BS is briefly described in the section "General Signal Transmission and Reception Procedure in NB-IoT". Specifically, the above procedure may be subdivided into a procedure in which the NB-IoT UE searches for an initial cell and a procedure in which the NB-IoT UE obtains system information.
  • FIG. 21 illustrates a particular procedure for signaling between a UE and a BS (e.g., NodeB, eNodeB, eNB, gNB, etc.) for initial access in the NB-IoT.
  • a BS e.g., NodeB, eNodeB, eNB, gNB, etc.
  • a normal initial access procedure, an NPSS/NSSS configuration, and acquisition of system information (e.g., MIB, SIB, etc.) in the NB-IoT will be described with reference to FIG. 21 .
  • FIG. 21 illustrates an example of the initial access procedure in the NB-IoT.
  • the name of each physical channel and/or signal may vary depending on the wireless communication system to which the NB-IoT is applied.
  • the NB-IoT based on the LTE system is considered in FIG. 21 , this is merely for convenience of description and details thereof are applicable to the NB-IoT based on the NR system.
  • the details of the initial access procedure are also applicable to the MTC.
  • the NB-IoT UE may receive a narrowband synchronization signal (e.g., NPSS, NSSS, etc.) from the base station (S2110 and S2120).
  • the narrowband synchronization signal may be transmitted through physical layer signaling.
  • the NB-IoT UE may receive a master information block (MIB) (e.g., MIB-NB) from the base station on an NPBCH (S2130).
  • MIB master information block
  • the MIB may be transmitted through higher layer signaling (e.g., RRC signaling).
  • the NB-IoT UE may receive a system information block (SIB) from the base station on an NPDSH (S2140 and S2150). Specifically, the NB-IoT UE may receive SIB1-NB, SIB2-NB, etc. on the NPDSCH through the higher layer signaling (e.g., RRC signaling).
  • SIB1-NB may refer to system information with high priority among SIBs
  • SIB2-NB may refer to system information with lower priority than SIB1-NB.
  • the NB-IoT may receive an NRS from the BS (S2160), and this operation may be performed through physical layer signaling.
  • the procedure in which the NB-IoT UE performs random access to the base station is briefly described in the section "General Signal Transmission and Reception Procedure in NB-IoT". Specifically, the above procedure may be subdivided into a procedure in which the NB-IoT UE transmits a preamble to the base station and a procedure in which the NB-IoT receives a response for the preamble.
  • FIG. 22 illustrates a particular procedure for signaling between a UE and a base station (e.g., NodeB, eNodeB, eNB, gNB, etc.) for random access in the NB-IoT.
  • a base station e.g., NodeB, eNodeB, eNB, gNB, etc.
  • FIG. 22 illustrates a particular procedure for signaling between a UE and a base station (e.g., NodeB, eNodeB, eNB, gNB, etc.) for random access in the NB-IoT.
  • a base station e.g., NodeB, eNodeB, eNB, gNB, etc.
  • messages e.g., msg1, msg2, msg3, msg4 used therefor.
  • FIG. 22 illustrates an example of the random access procedure in the NB-IoT.
  • the name of each physical channel, physical signal, and/or message may vary depending on the wireless communication system to which the NB-IoT is applied.
  • the NB-IoT based on the LTE system is considered in FIG. 22 , this is merely for convenience of description and details thereof are applicable to the NB-IoT based on the NR system.
  • the details of the initial access procedure are also applicable to the MTC.
  • the NB-IoT may be configured to support contention-based random access.
  • the NB-IoT UE may select an NPRACH resource based on the coverage level of the corresponding UE.
  • the NB-IoT UE may transmit a random access preamble (i.e., message 1, msg1) to the base station on the selected NPRACH resource.
  • a random access preamble i.e., message 1, msg1
  • the NB-IoT UE may monitor an NPDCCH search space to search for an NPDCCH for DCI scrambled with an RA-RNTI (e.g., DCI format N1).
  • the UE may receive an RAR (i.e., message 2, msg2) from the base station on an NPDSCH related to the NPDCCH.
  • the NB-IoT UE may obtain a temporary identifier (e.g., temporary C-RNTI), a timing advance (TA) command, etc. from the RAR.
  • the RAR may also provide an uplink grant for a scheduled message (i.e., message 3, msg3).
  • the NB-IoT UE may transmit the scheduled message to the base station. Then, the base station may transmit an associated contention resolution message (i.e., message 4, msg4) to the NB-IoT UE in order to inform that the random access procedure is successfully completed.
  • an associated contention resolution message i.e., message 4, msg4
  • the base station and the NB-IoT UE may complete the random access.
  • the NB-IoT UE may transit to an idle state (e.g., RRC_IDLE state) and/or an inactive state (e.g., RRC_INACTIVE state) to reduce power consumption.
  • the NB-IoT UE may be configured to operate in DRX mode after transiting to the idle state and/or the inactive state.
  • the NB-IoT UE may be configured to monitor an NPDCCH related to paging only in a specific subframe (frame or slot) according to a DRX cycle determined by the BS.
  • the NPDCCH related to paging may refer to an NPDCCH scrambled with a P-RNTI.
  • FIG. 23 illustrates an example of DRX mode in an idle state and/or an inactive state.
  • FIG. 24 illustrates an example of a DRX configuration and indication procedure for the NB-IoT UE.
  • the procedure in FIG. 24 is merely exemplary, and the methods proposed in the present disclosure are not limited thereto.
  • the NB-IoT UE may receive DRX configuration information from the base station (e.g., NodeB, eNodeB, eNB, gNB, etc.) (S2410).
  • the UE may receive the information from the base station through higher layer signaling (e.g., RRC signaling).
  • the DRX configuration information may include DRX cycle information, a DRX offset, configuration information for DRX-related timers, etc.
  • the NB-IoT UE may receive a DRX command from the base station (S2420).
  • the UE may receive the DRX command from the base station through higher layer signaling (e.g., MAC-CE signaling).
  • higher layer signaling e.g., MAC-CE signaling
  • the NB-IoT UE may monitor an NPDCCH in a specific time unit (e.g., subframe, slot, etc.) based on the DRX cycle (S2430).
  • the NPDCCH monitoring may mean a process of decoding a specific portion of the NPDCCH based on a DCI format to be received in a corresponding search space and scrambling a corresponding CRC with a specific predefined RNTI value in order to check whether the scrambled CRC matches (i.e. corresponds to) a desired value.
  • the NB-IoT UE may initialize (or reconfigure) the connection (e.g., RRC connection) with the base station (for example, the UE may perform the cell search procedure of FIG. 20 ).
  • the NB-IoT UE may receive (or obtain) new system information from the base station (for example, the UE may perform the system information acquisition procedure of FIG. 20 ).
  • a user equiopment may determine a position at which the UE will monitor paging based on a paging occasion (PO) and paging frame (PF) determined based on its UE_ID.
  • PO paging occasion
  • PF paging frame
  • a plurality of UEs may expect paging in one PO, and the number of the UEs may be determined according to a configuration in an SIB transmitted by a base station (BS).
  • BS base station
  • a group of a plurality of UEs which may expect paging in the same PO will be defined as a UE-group-per-PO.
  • a method of using a wake-up signal (WUS) for power saving of a UE has been introduced to the Rel-15 NB-IoT and MTC standard.
  • a UE capable of using the WUS that is, a WUS-capable UE attempts to detect the WUS based on information configured by a BS before monitoring a search space for paging.
  • the UE may expect transmission of paging in POs related to the position of detecting the WUS and monitor the search space for paging.
  • the UE fails to detect the WUS, the UE may not monitor (or skip monitoring) the search space for paging.
  • the Rel-15 standard defines that a WUS transmission position is determined to be a position relative to a PO indicated by the WUS, and all WUS-capable UEs monitoring the same PO share the same WUS and the same WUS transmission position. Accordingly, when a WUS transmitted for a specific PO is present, all WUS-capable UEs in a UE-group-per-PO corresponding to the PO should perform paging monitoring.
  • FIG. 25 illustrates an exemplary timing relationship between a WUS and a PO.
  • a UE may receive WUS configuration information from a BS and monitor a WUS based on the WUS configuration information. More specifically, the UE receives the configuration information related to the WUS from the BS by higher-layer signaling. The UE monitors/receives the WUS from the BS during a configured maximum WUS duration.
  • the WUS configuration information may include, for example, information about the maximum WUS duration, the number of consecutive POs related to the WUS, and a gap.
  • the maximum WUS duration is a maximum time period during which the WUS is transmittable, which may be expressed as a ratio of a maximum repetition number (e.g., Rmax) related to a PDCCH.
  • the WUS may be transmitted repeatedly one or more times during the maximum WUS duration.
  • the number of POs related to the WUS is the number of POs in which the UE will not monitor a channel related to paging, when the UE fails to detect the WUS (or the number of POs in which the UE will monitor the channel related to paging, when the UE detects the WUS).
  • the gap information indicates a time gap between the end of the maximum WUS duration and the first PO related to the WUS.
  • a WUS duration may be short for a UE in good coverage and long for a UE in bad coverage.
  • a UE Upon detection of the WUS, a UE does not monitor the WUS until the first PO related to the WUS. The UE does not monitor the WUS either during a gap duration. Therefore, when the UE fails to detect the WUS during the maximum WUS duration, the UE does not monitor the channel related to paging in the POs related to the WUS (or the UE remains in sleep mode).
  • Paging may be transmitted only to a part of the UEs of the same UE-group-per-PO according to determination of a mobility management entity (MME) or a BS (eNB or gNB). Because according to the current standard, information indicating UEs to which a WUS and paging are directed among the UEs of a UE-group-per-PO is delivered on an NPDSCH carrying paging traffic, some UEs may perform unnecessary NPDCCH/NPDSCH decoding.
  • MME mobility management entity
  • eNB gNode B
  • a PDCCH (MPDCCH or NPDCCH) and PDSCH (or NPDSCH) for paging reception may be repeatedly transmitted and received tens of times to a few thousand times, for coverage enhancement.
  • UEs to which the paging is not directed may identify the absence of paging for the UEs only after decoding both of a PDCCH (MPDCCH or NPDCCH) and a related PDSCH (or NPDSCH) as well as after detecting the WUS. Accordingly, the UEs may suffer from much unnecessary power consumption due to the unnecessary operation of receiving the WUS, the PDCCH (MPDCCH or NPDCCH), and the related PDSCH (or NPDSCH).
  • the present disclosure proposes criteria for applying a WUS based on UE sub-grouping and methods of configuring the UE sub-grouping, in order to reduce unnecessary paging monitoring of WUS-capable UEs.
  • Each UE sub-group configured in the proposed methods of the present disclosure may be configured independently with a WUS distinguished by a time-domain resource, frequency-domain resource, and/or code-domain resource.
  • a WUS resource a specific time-domain resource, frequency-domain resource, and/or code-domain resource configurable for a specific UE sub-group to transmit and receive a WUS.
  • the present disclosure may be applied in the same/similar manner to a 5G/NR system.
  • the term "subframe” may be replaced with "slot” (e.g., refer to FIGS. 5 and 9 and a related description) in the 5G/NR system.
  • a WUS refers to a signal used to indicate whether a UE should monitor a PDCCH (MPDCCH or NPDCCH) to receive paging (in a specific cell).
  • the WUS is associated with one or more POs according to whether extended discontinuous reception (DRX) is configured.
  • a UE (which has received the WUS) may additionally perform the aforedescribed DRX operation and/or cell reselection operation.
  • WUS e.g., MTC wake-up signal (MWUS) or narrowband wake-up signal (NWUS)
  • MTC wake-up signal MWUS
  • NWUS narrowband wake-up signal
  • a BS first generates a sequence (used) for a WUS in a specific subframe.
  • the BS may generate the sequence (used) for the WUS by using an equation defined in 3GPP technical specification (TS) 36.211 V15.2.0. More specifically, the sequence w(m) (used) for the WUS may be generated based on Equation 3.
  • Equation 3 x represents a subframe carrying the WUS, ranging from 0 to M-1 where M is the number of subframes carrying the WUS, corresponding to an actual WUS duration.
  • e ⁇ j ⁇ un n + 1 131 represents a Zadoff-Chu (ZC) sequence and ⁇ n f ,n s ( m' ) represents a complex-valued symbol related to a scrambling sequence.
  • N ID Ncell represents a physical layer cell identity (ID)
  • c n f ,n s ( i ) represents a scrambling sequence which may have a sample length of 2*132M.
  • i may range from 0 to 2* 132M-1.
  • the scrambling sequence may be given based on a Gold sequence.
  • the BS maps the generated sequence to at least one resource element (RE), and transmits the WUS on the mapped RE(s) to a UE.
  • RE resource element
  • the at least one RE may cover at least one of a time resource, a frequency resource, or an antenna port.
  • the UE receives the WUS from the BS (or the UE may assume that the WUS is transmitted on specific RE(s) from the BS) (e.g., refer to step S2604 in FIG. 26 ).
  • the UE may then identify (or determine) whether paging will be received, based on the received WUS (e.g., refer to step S2606 in FIG. 26 ).
  • the UE When paging is transmitted, the UE receives the paging based on the aforedescribed paging reception-related operation, and performs an RRC idle mode-to-RRC connected mode transmission procedure.
  • the present disclosure proposes a method of determining a condition for applying UE sub-grouping and configuring the UE sub-grouping by a base station and a method of recognizing and performing the UE sub-grouping by a UE, when the UE sub-grouping is applied to WUS transmission and reception.
  • One or a combination of two or more of the following Method 1-1, Method 1-2, Method 1-3, Method 1-4, Method 1-5, Method 1-6, or Method 1-7 can be used as a method of performing the UE sub-grouping.
  • Method 1-1 Method of performing UE sub-grouping for a WUS based on UE_ID
  • UE_ID is UE identification information based on an international mobile subscriber identity (IMSI). Characteristically, the definition of UE_ID used to determine a PO in 3GPP TS 36.304 V15.0.0. may be used for UE_ID herein. For example, when a P-RNTI is monitored on a PDCCH, UE_ID may be given as (IMSI mod 1024). When a P-RNTI is monitored on an NPDCCH, UE_ID may be given as (IMSI mod 4096). When a P-RNTI is monitored on an MPDCCH, UE_ID may be given as (IMSI mod 16394). Herein, mod represents a modulo operation.
  • IMSI international mobile subscriber identity
  • a PF, a PO, and a paging narrowband (PNB) are determined based on DRX parameters provided in system information according to Equation 4, Equation 5, and Equation 6.
  • i_s floor UE _ ID / N mod N s
  • PNB floor UE _ ID / N * N s mod N n
  • Equation 4 represents a modulo operation
  • floor represents a floor function
  • / represents division
  • * represents multiplication
  • div represents a function of obtaining a quotient
  • min(A, B) represents the smaller value among A and B
  • max (A, B) represents the larger value among A and B.
  • Method 1-1 a method of uniformly distributing UE_IDs to UE sub-groups may be considered.
  • MTC when the index of each UE sub-group is defined as c g based on UE_IDs, c g may be determined by Equation (Eq-1-1-a-MTC).
  • NB-IoT when the index of each UE sub-group is defined as c g based on UE_IDs, c g may be determined by Equation (Eq-1-1-a-NB).
  • Equation (Eq-1-1-a-MTC) and Equation (Eq-1-1-a-NB) UE_ID, N S , N n , and W conform to the definitions of Section 7 of 3GPP TS 36.304 V15.0.0 (e.g., refer to the description related to Equation 4, Equation 5, and Equation 6).
  • N SG represents the number of deployed sub-groups.
  • the UE may select a WUS resource (e.g., a time-domain resource, frequency-domain resource, and/or code-domain resource) corresponding to a UE sub-group index calculated by Equation (Eq-1-1-a-MTC) or Equation (Eq-1-1-a-NB) and monitor a WUS in the selected WUS resource.
  • c g floor UE _ ID / N ⁇ N S ⁇ N n mod N SG
  • c g floor UE _ ID / N ⁇ N S ⁇ W mod N SG
  • c g floor UE _ ID / N ⁇ N S ⁇ N n mod N SG + 1
  • c g floor UE _ ID / N ⁇ N S ⁇ W mod N SG + 1
  • a method of non-uniformly distributing UE_IDs to UE sub-groups may be considered. This may be intended to reduce the selection frequency of a WUS resource corresponding to a specific UE sub-group. For example, when a WUS corresponding to a specific UE sub-group shares the same resource with a legacy WUS (e.g., a WUS for a UE to which UE sub-grouping is not applied), the above operation may be intended to control effects on legacy WUS-capable UEs.
  • a legacy WUS e.g., a WUS for a UE to which UE sub-grouping is not applied
  • c g when the index of each UE sub-group is defined as c g based on UE_IDs, c g may be determined to be a smallest index c g (0 ⁇ c g ⁇ N SG -1) satisfying Equation (Eq-1-1-b-MTC).
  • c g In NB-IoT, c g may be determined to be a smallest index c g (0 ⁇ c g ⁇ N SG -1) satisfying Equation (Eq-1-1-b-NB).
  • N SG represents the number of used sub-groups.
  • Equation (Eq-1-1-b-MTC) and Equation (Eq-1-1-b-NB) UE_ID, N S , N n , and W are defined in Section 7 of 3GPP TS 36.304 V15.0.0 (e.g., refer to the descriptions of Equation 4, Equation 5, and Equation 6).
  • W WUS (n) represents a weight for an n th UE sub-group, for non-uniformly distributing UE_IDs to UE sub-groups so that each UE sub-group includes a different number of UE_IDs
  • W WUS represents the sum of the weights of all sub-groups.
  • W WUS W WUS (0)+W WUS (1)+...+W WUS (N SG -1).
  • floor UE _ ID / N ⁇ N S ⁇ N n mod W WUS ⁇ W WUS 0 + W WUS 1 + ⁇ + W WUS c g
  • W WUS (n) corresponding to a specific index may be determined to be a weight for a sub-group sharing the same resource with a legacy WUS (e.g., W WUS (0)).
  • a legacy WUS e.g., W WUS (0)
  • c g may be determined to satisfy the condition that 1 ⁇ c g ⁇ N SG .
  • W WUS (n) may be signaled by a system information block (SIB) or higher-layer signaling such as radio resource control (RRC) signaling.
  • SIB system information block
  • RRC radio resource control
  • This signaling may be intended to adjust distribution of UE_IDs per sub-group according to a situation.
  • the base station (BS) may configure N SG weights for the respective sub-groups by an SIB. This operation may advantageously lead to flexible control of UE_ID distribution ratios across all sub-groups.
  • the BS may configure a weight (e.g., W WUS (0)) for a sub-group sharing the same resource with a legacy WUS and a weight (e.g., W WUS (n), for all n not zero) for a sub-group using a different resource from the legacy WUS by an SIB.
  • This operation may be intended to uniformly distribute UE_IDs among sub-groups using resources distinguished from resources for the legacy WUS, while variably controlling effects on the legacy WUS.
  • the BS may configure a ratio between a weight for a sub-group sharing the same resource with the legacy WUS and a weight for a sub-group using a different resource from the legacy WUS by an SIB.
  • This operation may advantageously reduce signaling overhead under the premise that the resources used for the legacy WUS are always used for a specific sub-group. Instead of the ratio between the two weights, the weight for the sub-group sharing the same resource with the legacy WUS may always be fixed to 1, while only the weight for the sub-group using a different resource from the legacy WUS may be configured.
  • the indexes of the UE sub-groups may be determined by a method of uniformly distributing UE_IDs (e.g., Eq-1-1-a-MTC or Eq-1-1-a-NB), and a WUS resource corresponding to each sub-group index may be determined by an SIB or higher-layer signaling such as RRC signaling.
  • UE_IDs are non-uniformly distributed such that a plurality of sub-group indexes correspond to a specific WUS resource, the effect that the number of UE_IDs is non-uniform for each WUS resource may be expected.
  • Method 1-2 Method of performing UE sub-grouping for a WUS based on coverage levels.
  • UE sub-grouping is performed for a WUS based on the coverage levels of UEs.
  • the coverage level of a UE refers to the state of a wireless channel environment in which the UE is placed.
  • a coverage level may be represented by, for example, a measurement such as reference signal received power (RSRP)/reference signal received quality (RSRQ) measured by the UE or a repetition number that the UE uses to transmit and receive an uplink (UL) or downlink (DL) channel.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • An RSRP/RSRQ value may be represented as quality information related a channel quality.
  • the UE when a UE identifies a change in its coverage level, the UE may indicate the change to a BS.
  • the UE when an RSRP/RSRQ value measured by the UE changes and thus does not satisfy the coverage level requirement of a current UE sub-group, the UE may indicate the change of the coverage level to the BS in a random access procedure.
  • the UE may use an idle-mode UL data transmission scheme such as early data transmission (EDT) to avoid unnecessary transition to the RRC connected mode.
  • EDT early data transmission
  • the BS may configure an additional RACH resource for coverage level reporting and indicate the configuration to the UE.
  • Method 1-3 Method of performing UE sub-grouping for a WUS by dedicated signaling from a BS (eNB or gNB).
  • Method 1-3 when UE sub-grouping of UEs is indicated by UE-specific dedicated signaling, a method to be applied is proposed.
  • UE-specific dedicated signaling may be dedicated RRC signaling that a UE obtains during RRC connection setup or in the RRC connected mode.
  • a UE may report information required for configuring UE sub-grouping (e.g., a coverage level, a type of service, a capability, and so on) on an NPUSCH.
  • UE-specific dedicated signaling may be information that the UE obtains in a step for Msg2 or Msg4 of an RACH procedure (or random access procedure).
  • the UE may report information required for configuring UE sub-grouping (e.g., a coverage level, a type of service, a capability, and so on) in a step for Msg1 or Msg3.
  • Method 1-4 Method of performing UE sub-grouping for a WUS based on the usage of a corresponding channel indicated by the WUS.
  • Method 1-4 it is proposed that UE sub-grouping of UEs is applied based on a corresponding channel indicated by a WUS.
  • the corresponding channel refers to a channel about which the WUS indicates information.
  • the UE may report its capability for a corresponding channel supported by the UE.
  • UE sub-grouping may be performed only when the BS provides the UE with additional signaling information.
  • the additional signaling information may be dedicated signaling as proposed in Method 1-3 or information that enables/disables WUS support for a specific corresponding channel obtainable in the RRC idle mode, such as an SIB.
  • the UE may monitor only a WUS corresponding to its UE sub-group.
  • the UE may identify information about a corresponding channel by comparing bit information included in a subsequent control channel or masked RNTIs, or may finally confirm information about the corresponding channel on a data channel indicated by the subsequent control channel.
  • the UE may monitor all available WUSs that can be monitored, irrespective of a WUS corresponding to its UE sub-group and a UE sub-grouping capability.
  • the UE may distinguish the corresponding channels by distinguishing WUS resources (e.g., time-domain, frequency-domain, and/or code-domain resources).
  • the UE may simultaneously monitor a WUS serving a purpose other than paging, which is distinguishable by a sequence (and/or frequency) in a specific time resource (e.g., a subframe period determined by a gap from a PO and a maximum duration) in which the UE monitors a WUS for paging.
  • the UE may determine how a subsequent corresponding channel will be transmitted, based on a detected WUS.
  • the defined corresponding channel may be a UL resource for a preconfigured UL transmission (e.g., semi-persistent scheduling (SPS)).
  • SPS semi-persistent scheduling
  • a WUS for which UE sub-grouping has been performed may be used for activating/deactivating the use of the preconfigured UL resource or indicating an ACK/NACK or a retransmission for the preconfigured UL resource.
  • the defined corresponding channel may be a DL resource for a preconfigured UL transmission (e.g., SPS).
  • a WUS for which UE sub-grouping has been performed may be used to indicate whether DCI providing information related to the preconfigured UL transmission is transmitted.
  • the defined corresponding channel may be DCI masked by a G-RNTI (or SC-RNTI) in single cell point to multipoint (SC-PTM).
  • a WUS for which UE sub-grouping has been performed may be used to indicate whether DCI masked by a G-RNTI (or SC-RNTI) is transmitted or whether a single cell multicast transport channel (SC-MTCH)(or single cell multicast control channel (SC-MCCH)) has been modified.
  • SC-MTCH single cell multicast transport channel
  • SC-MCCH single cell multicast control channel
  • different UE sub-groups may be configured in correspondence with the SC-RNTI and the G-RNTI.
  • the defined corresponding channel may have a multi-TB transmission structure.
  • a WUS for which UE sub-grouping has been performed may be used to activate/deactivate the use of the multi-TB transmission structure.
  • the WUS may be used to indicate whether a subsequent corresponding channel is in a DCI format supporting multi-TB transmission or a DCI format supporting single-TB transmission.
  • Multi-TB transmission refers to a transmission structure in which a plurality of traffic channels (e.g., (N)PDCCH or (N)PUSCH) are scheduled by one DCI (or a preconfigured resource without DCI).
  • Method 1-5 Method of performing UE sub-grouping for a WUS only based on a cell (or carrier) for which a UE has obtained UE sub-grouping information.
  • Method 1-5 it is proposed UE sub-grouping is applied only to a cell for which a UE has obtained UE sub-grouping information.
  • UE sub-grouping information when UE sub-grouping information is provided carrier-specifically, the term cell may be replaced with carrier.
  • a UE may perform a UE sub-grouping-related operation only for a cell for which the UE has been configured with UE sub-grouping information, skipping the UE sub-grouping-related operation for a cell for which the UE has not been configured with UE sub-grouping information.
  • specific criteria e.g., UE_ID, a coverage level, dedicated signaling, a corresponding channel, and so on
  • the UE may not expect a WUS-related operation until before obtaining UE sub-grouping information in an adjacent cell or a new cell, or may perform the WUS-related operation in a WUS resource (e.g., a WUS defined in Rel-15) which may be monitored UE-commonly irrespective of UE sub-grouping criteria.
  • a WUS resource e.g., a WUS defined in Rel-15
  • Method 1-6 Method of performing UE sub-grouping based on a time passed after the last UL transmission and/or DL reception.
  • Method 1-6 it is proposed that a UE is included in a specific UE sub-group based on a time of completing the last UL transmission and/or DL reception, and then switched to another UE sub-group a predetermined time later or skipping UE sub-grouping until before the next UL transmission and/or DL reception is completed.
  • the proposed method may be useful when there is a low possibility that the UE will be paged during a predetermined time after transmitting or receiving traffic.
  • Method 1-6 may be applied only to a case where the BS and the UE are capable of confirming transmission and reception of a channel to which the UL transmission and/or the DL reception is directed.
  • this case may correspond to a case in which the UE and the BS exchange information as is done in the EDT, a case in which whether a specific channel has been received may be feed backed through an HARQ-ACK channel, or a case of an RRC message.
  • Method 1-7 Method of hopping the sub-group index of a UE.
  • Method 1-7 it is proposed that when there is a fixed WUS resource corresponding to each sub-group index, the WUS sub-group index of a UE hops over time. This operation may be intended to prevent continuous performance degradation caused by the use of a specific WUS resource at a UE, when there is a difference in feature or gain between WUS resources used for sub-grouping.
  • the UE may determine that the sub-group index of a corresponding WUS hops in each PO.
  • a selected sub-group index may be maintained unchanged during a time period in which a WUS transmission starts and is repeated.
  • a parameter such as floor(SFN/T) may be used to achieve hopping effects.
  • the value of T may be determined to be the value of the DRX cycle.
  • floor() represents a floor function.
  • a sub-group index may be determined by Equation (Eq-1-7-a-MTC) for MTC, and Equation (Eq-1-7-a-NB) for NB-IoT.
  • a sub-group index may be determined by Equation (Eq-1-7-b-MTC) for MTC, and Equation (Eq-1-7-b-NB) for NB-IoT.
  • a mapping relationship between sub-group indexes and WUS resources may be changed over time, with the sub-group index of a UE fixed.
  • the present disclosure proposes a method of configuring related information by a base station (BS) and operations performed by a user equipment (UE), to apply UE sub-grouping to WUS transmission and reception.
  • BS base station
  • UE user equipment
  • One or a combination of two or more of the following Method 2-1, Method 2-2, Method 2-3, or Method 2-4 may be used as a method of configuring UE sub-grouping.
  • Method 2-1 when UE sub-grouping is configured, a method of determining a range to which the UE sub-grouping configuration is applied and related operations are proposed.
  • a unit for which UE sub-grouping information is configured may be a cell. This may be intended to reduce signaling overhead. Alternatively, when hopping is applied to a WUS, this may be intended to maintain the same WUS configuration irrespective of the transmission position (e.g., narrowband or carrier) of the WUS.
  • a unit for which UE sub-grouping information is configured may be a carrier in NB-IoT. Because a WUS is repeated a different number of times, power boosting is available or unavailable, or a different number of resources are available in each carrier, a carrier may be set as the unit in order to control the type of UE sub-grouping or the number of UE sub-groups, or enable/disable UE sub-grouping in consideration of the difference.
  • the term carrier may be replaced with narrowband. When frequency hopping is applied between narrowbands, a UE sub-grouping criterion may be determined to be a narrowband carrying a corresponding channel indicated by a WUS.
  • a unit for which UE sub-grouping is configured may be a corresponding channel indicated by a WUS.
  • a carrier (or narrowband) for which UE sub-grouping is supported may be limited to a carrier carrying paging.
  • UE sub-grouping may be performed only on a carrier (or narrowband) in which a transmission and reception structure for each purpose is operated.
  • Method 2-2 Method of determining whether UE sub-grouping is applied according to the gap capability of a UE.
  • a WUS-to-PO gap capability of a UE refers to a UE capability used to determine the size of a gap configured between the ending subframe of a WUS and a PO and may be defined as in 3GPP TS 36.304 V15.0.0.
  • a configuration related to UE sub-grouping may be independently set for each WUS-to-PO gap capability.
  • a higher-layer signal carrying UE sub-grouping-related configuration information may be designed to have an independent field for each WUS-to-PO gap capability.
  • UE sub-grouping may not be applied to a UE having a specific WUS-to-PO gap capability.
  • UE sub-grouping may not be applied to a large gap-capable UE (e.g., a UE configurable with a WUS-to-PO gap of ⁇ 1s, 2s ⁇ in an eDRX situation).
  • UE sub-grouping may not be applied to a short gap-capable UE (e.g., a UE unconfigurable with the WUS-to-PO gap of ⁇ 1s, 2s ⁇ in the eDRX situation).
  • the method proposed in Method 2-2 may be intended to reduce an increase in UE complexity for UE sub-grouping or the degradation of WUS detection performance for a UE having a capability with a relatively low requirement (e.g., a larger cap capability).
  • the method may be intended to reduce the degradation of WUS detection performance caused by UE sub-grouping for a UE having a shorter gap capability, to secure a sufficient time required to prepare for monitoring a corresponding channel after fast WUS detection.
  • Method 2-3 Method of determining whether UE sub-grouping is applied according to the size of a gap configured by a BS
  • Method 2-3 it is proposed that UE sub-grouping configurations are differentiated according to a configured size of a WUS-to-PO gap.
  • the size of a WUS-to-PO gap refers to the size of a gap configured between the ending subframe of a WUS and a PO, and may be defined as in 3GPP TS 36.304 V15.0.0.
  • a gap mentioned in Method 2-3 may be a gap illustrated in the aforedescribed drawing (e.g., FIG. 25 ) illustrating a WUS timing.
  • a configuration related to UE sub-grouping may be independently set for each WUS-to-PO gap size.
  • a BS may configure two or more gaps corresponding to one PO, and a higher-layer signal carrying UE sub-grouping-related configuration information may be designed to have an independent field for each WUS-to-PO gap size.
  • UE sub-grouping may not be applied for a specific WUS-to-PO gap size.
  • UE sub-grouping may not be applied to a larger gap (e.g., a gap size of ⁇ 1s, 2s ⁇ configured in an eDRX situation). This is because for a larger gap, a separate WUS receiver operating with low complexity may be applied, and in this case, the degradation of WUS performance caused by UE sub-grouping may be relatively serious.
  • UE sub-grouping may not be applied to a shorter gap (e.g., a configured gap size of ⁇ 40ms, 80ms, 160ms, 240ms ⁇ ). This may be intended to secure an extra spacing by shortening an actual transmission duration instead of performing UE sub-grouping because there is a relative shortage of an extra spacing between a WUS and a PO.
  • UE sub-grouping may be applied depending on whether a UE performs an eDRX operation. For example, UE sub-grouping may not be applied in eDRX. This is intended to prevent the degradation of WUS detection performance caused by UE sub-grouping because missed paging may lead to a fatal delay to the next paging transmittable time in eDRX.
  • a separate configuration may be used, which distinguishes UE sub-grouping for an eDRX operation from UE sub-grouping for a DRX operation.
  • Method 2-4 Method of reporting information related to its mobility for UE sub-grouping by a UE
  • Method 2-4 it is proposed that a UE reports information related to its mobility for UE sub-grouping.
  • the mobility may mean a change in a communication channel environment, caused by movement of the UE to another physical position.
  • the UE may autonomously determine whether to perform UE sub-grouping based on its mobility and report the determination to the BS.
  • the BS may transmit a WUS by applying a UE sub-grouping-related operation for the UE.
  • the UE may identify that the UE sub-grouping operation is possible at a transmission position at which the UE expects a WUS, and perform the UE sub-grouping-related operation after transmitting a UE sub-groping-capable report based on its mobility to the BS.
  • the UE may start UE sub-grouping after receiving separate confirmation signaling for the report.
  • (1) a reference predetermined in a standard or (2) a reference configurable by higher-layer signaling from the BS may be used as reference mobility for determining whether to perform UE sub-grouping by the UE.
  • the UE may report information about its mobility to the BS, and the BS may determine whether UE sub-grouping is to be performed based on the report and configure the determination result for the UE. After reporting the information about its measured mobility, the UE may expect signaling indicating whether UE sub-grouping is to be performed from the BS. Upon acquisition of information related to UE sub-grouping, the UE may determine whether to apply UE sub-grouping according to the received information.
  • the UE may monitor a common WUS (e.g., a WUS identifiable by all WUS-capable UEs irrespective of UE sub-groups), without expecting a UE sub-grouping-related operation.
  • a common WUS e.g., a WUS identifiable by all WUS-capable UEs irrespective of UE sub-groups
  • the mobility-based report may be restrictively reflected in specific UE sub-grouping criteria. For example, because the coverage level of a UE with mobility may change over time, it may be determined whether coverage level-based UE sub-grouping is to be applied according to a mobility-based report. In contrast, a criterion such as UE_ID is applicable without much relation to the mobility of a UE, UE_ID-based UE sub-grouping may always be applied irrespective of the mobility-based report information.
  • FIG. 26 is an exemplary flowchart illustrating a method of the present disclosure. While the example of FIG. 26 is described in the context of a user equipment (UE), an operation corresponding to the operation illustrated in FIG. 26 may be performed by a base station (BS). As described before, Method 1-1 to Method 1-7 of the present disclosure may be performed independently, or in combination of one or more of them.
  • UE user equipment
  • BS base station
  • a UE may determine a WUS resource based on UE sub-grouping for a WUS.
  • the UE may determine index information (e.g., UE sub-group index information c g ) indicating a WUS resource based on identification information (e.g., UE_ID) of the UE and determine a WUS resource related to a sub-group of the UE based on the determined index information (e.g., refer to the description of Method 1-1).
  • index information e.g., UE sub-group index information c g
  • identification information e.g., UE_ID
  • the index information indicating the WUS resource may be determined based on the identification information (e.g., UE_ID) of the UE, parameters (e.g., N and N s ) related to a DRX cycle of the UE, information (e.g., N n ) about the number of paging narrowbands, and information (e.g., N SG ) about the number of UE groups for the WUS (e.g., refer to Eq-1-1-a-MTC).
  • the identification information e.g., UE_ID
  • parameters e.g., N and N s
  • information e.g., N n
  • information e.g., N SG
  • N SG the number of UE groups for the WUS
  • the index information indicating the WUS resource may be determined based on the identification information (e.g., UE_ID) of the UE, the parameters (e.g., N and N s ) related to the DRX cycle of the UE, the information (e.g., N n ) about the number of paging narrowbands, and information (e.g., W WUS ) about the sum of weights of all UE sub-groups (e.g., refer to Eq-1-1-b-MTC).
  • the identification information e.g., UE_ID
  • the parameters e.g., N and N s
  • the information e.g., N n
  • W WUS information about the sum of weights of all UE sub-groups (e.g., refer to Eq-1-1-b-MTC).
  • the index information indicating the WUS resource may be determined based on the identification information (e.g., UE_ID) of the UE, the parameters (e.g., N and N s ) related to the DRX cycle of the UE, information about the sum (e.g., W) of weights of paging carriers, and the information (e.g., N SG ) about the number of UE groups for the WUS (e.g., refer to Eq-1-1-a-NB).
  • the identification information e.g., UE_ID
  • the parameters e.g., N and N s
  • information about the sum e.g., W
  • the information e.g., N SG
  • the number of UE groups for the WUS e.g., refer to Eq-1-1-a-NB.
  • the index information indicating the WUS resource may be determined based on the identification information (e.g., UE_ID) of the UE, the parameters (e.g., N and N s ) related to the DRX cycle of the UE, the information about the sum (e.g., W) of the weights of the paging carriers, and the information (e.g., W WUS ) about the sum of the weights of all UE sub-groups (e.g., refer to Eq-1-1-b-NB).
  • the identification information e.g., UE_ID
  • the parameters e.g., N and N s
  • the information about the sum (e.g., W) of the weights of the paging carriers e.g., W WUS ) about the sum of the weights of all UE sub-groups (e.g., refer to Eq-1-1-b-NB).
  • the UE may determine a WUS resource based on a coverage level (e.g., refer to Method 1-2) in step S2602.
  • a coverage level e.g., refer to Method 1-2
  • the coverage level of a UE refers to the state of a wireless channel environment in which the UE is placed.
  • a measurement such as a UE-measured RSRP/RSRQ or a repetition number used for the UE to transmit a UL channel or receive a DL channel may be used as the coverage level.
  • the UE may receive UE-specific dedicated signaling from the BS.
  • the dedicated signaling indicates UE sub-grouping
  • the UE may report information for configuring UE sub-grouping (e.g., a coverage level, a type of service, a capability, and so on) via a PUSCH (e.g., NPUSCH), Msg1, or Msg3 (e.g., refer to Method 1-3).
  • the UE may determine a WUS resource only for a cell (or carrier) for which the UE has acquired UE sub-grouping information, based on UE sub-grouping (e.g., refer to Method 1-5).
  • the UE may determine a UE sub-group and a WUS resource corresponding to the UE sub-group, based on a time of completing the last UL transmission and/or DL reception (e.g., refer to Method 1-6).
  • UE sub-group index information and/or a WUS resource corresponding to the UE sub-group index information may hop over time by the UE (e.g., refer to Method 1-7). More specifically, the UE sub-group index information and/or the WUS resource corresponding to the UE sub-group index information may be determined based on an SFN (e.g., refer to Method 1-7).
  • the WUS may be used to indicate transmission and reception of a channel as well as a paging signal.
  • the UE may determine a WUS resource based on the channel (e.g., corresponding channel) indicated by the WUS (e.g., refer to Method 1-4).
  • the UE may report a capability for a channel (e.g., corresponding channel) supported for UE sub-grouping to the BS, and the BS may indicate to the UE to determine a WUS resource based on UE sub-grouping by separate signaling information (e.g., refer to Method 1-4).
  • the UE may monitor a WUS based on the WUS resource.
  • the UE may monitor the WUS based on the index information (e.g., the UE sub-group index information c g ) determined in step S2602 (or based on the WUS resource indicated by the index information) (e.g., refer to Method 1-1).
  • the UE may monitor the WUS based on a WUS resource corresponding to the coverage level determined in step S2602 (e.g., refer to Method 1-2).
  • the UE may monitor the WUS based on the hopped index information (and/or the WUS resource corresponding to the hopped index information) (e.g., refer to Method 1-7).
  • the UE may receive a paging signal in a PO related to the detected WUS in step S2606.
  • the WUS may be used to indicate whether a paging signal will be transmitted and received, and also whether a channel (e.g., corresponding channel) other than the paging signal will be transmitted and received (e.g., refer to Method 1-4).
  • the channel (e.g., corresponding channel) related to the WUS may be a UL resource for a preconfigured UL transmission (e.g., SPS), a DL resource for a preconfigured DL transmission (e.g., SPS), DCI masked by a G-RNTI (or SC-RNTI) in SC-PTM, an SC-MTCH (or SC-MCCH), and/or a channel of a multi-TB transmission structure (refer to Method 1-4).
  • a preconfigured UL transmission e.g., SPS
  • a DL resource for a preconfigured DL transmission e.g., SPS
  • DCI masked by a G-RNTI (or SC-RNTI) in SC-PTM an SC-MTCH (or SC-MCCH)
  • a channel of a multi-TB transmission structure (refer to Method 1-4).
  • the UE may determine and receive the channel related to the WUS based on bit information included in a control channel, an RNTI by which the control channel is masked, information received on a data channel indicated by the control channel, and/or the WUS resource (e.g., refer to Method 1-4).
  • the UE may skip reception of a paging signal related to the WUS in step S2606.
  • the UE (which has received the WUS) may additionally perform the aforedescribed DRX operation and/or cell reselection operation.
  • Method 1-1 to Method 1-7 may be performed in the steps of FIG. 26 , and the description of Method 1-1 to Method 1-7 is incorporated by reference in the description of FIG. 26 in its entirety.
  • FIG. 27 illustrates a communication system 1 applied to the present disclosure.
  • the communication system 1 applied to the present disclosure includes wireless devices, base stations (BSs), and a network.
  • the wireless devices refer to devices performing communication by radio access technology (RAT) (e.g., 5G New RAT (NR) or LTE), which may also be called communication/radio/5G devices.
  • RAT radio access technology
  • the wireless devices may include, but no limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device/server 400.
  • the vehicles may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle (V2V) communication.
  • the vehicles may include an unmanned aerial vehicle (UAV) (e.g., a drone).
  • UAV unmanned aerial vehicle
  • the XR device may include an augmented reality (AR)/virtual reality (VR)/mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a television (TV), a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and so on.
  • AR augmented reality
  • VR virtual reality
  • MR mixeded reality
  • the hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or smart glasses), and a computer (e.g., a laptop).
  • the home appliance may include a TV, a refrigerator, and a washing machine.
  • the IoT device may include a sensor and a smart meter.
  • the BSs and the network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS/network node for other wireless devices.
  • the wireless devices 100a to 100f may be connected to the network 300 via the BSs 200.
  • An AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300.
  • the network 300 may be configured by using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network.
  • the wireless devices 100a to 100f may communicate with each other through the BSs 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without intervention of the BSs/network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g.
  • V2V/vehicle-to-everything (V2X) communication may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.
  • Wireless communication/connections 150a, 150b, or 150c may be established between the wireless devices 100a to 100f and the BSs 200, or between the BSs 200.
  • the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as UL/DL communication 150a, sidelink communication 150b (or, D2D communication), or inter-BS communication 150c (e.g. relay, integrated access backhaul (IAB)).
  • RATs e.g., 5G NR
  • UL/DL communication 150a UL/DL communication 150a
  • sidelink communication 150b or, D2D communication
  • inter-BS communication 150c e.g. relay, integrated access backhaul (IAB)
  • a wireless device and a BS/a wireless devices, and BSs may transmit/receive radio signals to/from each other through the wireless communication/connections 150a, 150b, and 150c.
  • various configuration information configuring processes various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.
  • various signal processing processes e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping
  • resource allocating processes for transmitting/receiving radio signals
  • FIG. 28 illustrates wireless devices applicable to the present disclosure.
  • a first wireless device 100 and a second wireless device 200 may transmit radio signals through a variety of RATs (e.g., LTE and NR).
  • ⁇ the first wireless device 100 and the second wireless device 200 ⁇ may correspond to ⁇ the wireless devices 100a to 100f and the BSs 200 ⁇ and/or ⁇ the wireless devices 100a to 100f and the wireless devices 100a to 100f ⁇ of FIG. 27 .
  • the first wireless device 100 may include at least one processor 102 and at least one memory 104, and may further include at least one transceiver 106 and/or at least one antenna 108.
  • the processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor 102 may process information within the memory 104 to generate first information/signal and then transmit a radio signal including the first information/signal through the transceiver 106.
  • the processor 102 may receive a radio signal including second information/signal through the transceiver 106 and then store information obtained by processing the second information/signal in the memory 104.
  • the memory 104 may be coupled to the processor 102 and store various types of information related to operations of the processor 102.
  • the memory 104 may store software code including commands for performing a part or all of processes controlled by the processor 102 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor 102 and the memory 104 may be a part of a communication modem/circuit/chip designed to implement an RAT (e.g., LTE or NR).
  • the transceiver 106 may be coupled to the processor 102 and transmit and/or receive radio signals through the at least one antenna 108.
  • the transceiver 106 may include a transmitter and/or a receiver.
  • the transceiver 106 may be interchangeably used with an RF unit.
  • a wireless device may refer to a communication modem/circuit/chip.
  • the second wireless device 200 may include at least one processor 202 and at least one memory 204, and may further include at least one transceiver 206 and/or at least one antenna 208.
  • the processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor 202 may process information within the memory 204 to generate third information/signal and then transmit a radio signal including the third information/signal through the transceiver 206.
  • the processor 202 may receive a radio signal including fourth information/signal through the transceiver 206 and then store information obtained by processing the fourth information/signal in the memory 204.
  • the memory 204 may be coupled to the processor 202 and store various types of information related to operations of the processor 202.
  • the memory 204 may store software code including commands for performing a part or all of processes controlled by the processor 202 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor 202 and the memory 204 may be a part of a communication modem/circuit/chip designed to implement an RAT (e.g., LTE or NR).
  • the transceiver 206 may be coupled to the processor 202 and transmit and/or receive radio signals through the at least one antenna 208.
  • the transceiver 206 may include a transmitter and/or a receiver.
  • the transceiver 206 may be interchangeably used with an RF unit.
  • a wireless device may refer to a communication modem/circuit/chip.
  • One or more protocol layers may be implemented by, but not limited to, one or more processors 102 and 202.
  • the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP).
  • the one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and/or one or more service data units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • PDUs protocol data units
  • SDUs service data units
  • the one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206.
  • the one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • signals e.g., baseband signals
  • the one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers.
  • the one or more processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be included in the one or more processors 102 and 202, or may be stored in the one or more memories 104 and 204 and executed by the one or more processors 102 and 202.
  • the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented as code, instructions, and/or a set of instructions in firmware or software.
  • the one or more memories 104 and 204 may be coupled to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands.
  • the one or more memories 104 and 204 may be configured as read-only memories (ROMs), random access memories (RAMs), electrically erasable programmable read-only memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof.
  • the one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202.
  • the one or more memories 104 and 204 may be coupled to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels, mentioned in the methods and/or operational flowcharts of this document, to one or more other devices.
  • the one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, from one or more other devices.
  • the one or more transceivers 106 and 206 may be coupled to the one or more processors 102 and 202 and transmit and receive radio signals.
  • the one or more processors 102 and 202 may control the one or more transceivers 106 and 206 to transmit user data, control information, or radio signals to one or more other devices.
  • the one or more processors 102 and 202 may control the one or more transceivers 106 and 206 to receive user data, control information, or radio signals from one or more other devices.
  • the one or more transceivers 106 and 206 may be coupled to the one or more antennas 108 and 208 and configured to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, through the one or more antennas 108 and 208.
  • the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).
  • the one or more transceivers 106 and 206 may convert received radio signals/channels etc. from RF band signals into baseband signals in order to process received user data, control information, radio signals/channels, etc. using the one or more processors 102 and 202.
  • the one or more transceivers 106 and 206 may convert the user data, control information, radio signals/channels, etc. processed using the one or more processors 102 and 202 from the base band signals into the RF band signals.
  • the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.
  • FIG. 29 illustrates another example of wireless devices applied to the present disclosure.
  • the wireless devices may be implemented in various forms according to use-cases/services (refer to FIG. 27 ).
  • wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 28 and may be configured as various elements, components, units/portions, and/or modules.
  • each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140.
  • the communication unit may include a communication circuit 112 and transceiver(s) 114.
  • the communication circuit 112 may include the one or more processors 102 and 202 and/or the one or more memories 104 and 204 of FIG. 28 .
  • the transceiver(s) 114 may include the one or more transceivers 106 and 206 and/or the one or more antennas 108 and 208 of FIG. 28 .
  • the control unit 120 is electrically coupled to the communication unit 110, the memory unit 130, and the additional components 140 and provides overall control to operations of the wireless devices. For example, the control unit 120 may control an electric/mechanical operation of the wireless device based on programs/code/commands/information stored in the memory unit 130.
  • the control unit 120 may transmit the information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface or store, in the memory unit 130, information received through the wireless/wired interface from the outside (e.g., other communication devices) via the communication unit 110.
  • the additional components 140 may be configured in various manners according to the types of wireless devices.
  • the additional components 140 may include at least one of a power unit/battery, an input/output (I/O) unit, a driver, and a computing unit.
  • the wireless device may be configured as, but not limited to, the robot (100a of FIG. 27 ), the vehicles (100b-1 and 100b-2 of FIG. 27 ), the XR device (100c of FIG. 27 ), the hand-held device (100d of FIG. 27 ), the home appliance (100e of FIG. 27 ), the IoT device (100f of FIG.
  • the wireless device may be mobile or fixed according to a use-case/service.
  • all of the various elements, components, units/portions, and/or modules in the wireless devices 100 and 200 may be coupled to each other through a wired interface or at least a part thereof may be wirelessly coupled to each other through the communication unit 110.
  • the control unit 120 and the communication unit 110 may be coupled wiredly, and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly coupled through the communication unit 110.
  • Each element, component, unit/portion, and/or module within the wireless devices 100 and 200 may further include one or more elements.
  • the control unit 120 may be configured as a set of one or more processors.
  • control unit 120 may be configured as a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphical processing unit, and a memory control processor.
  • memory unit 130 may be configured as a random access memory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and/or a combination thereof.
  • FIG. 29 An implementation example of FIG. 29 will be described in detail with reference to the drawings.
  • FIG. 30 illustrates a portable device applied to the present disclosure.
  • the portable device may include a smartphone, a smartpad, a wearable device (e.g., a smart watch and smart glasses), and a portable computer (e.g., a laptop).
  • the portable device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS advanced mobile station
  • WT wireless terminal
  • a portable device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a power supply unit 140a, an interface unit 140b, and an I/O unit 140c.
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • the blocks 110 to 130/140a to 140c correspond to the blocks 110 to 130/140 of FIG. 29 , respectively.
  • the communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from another wireless device and a BS.
  • the control unit 120 may perform various operations by controlling elements of the portable device 100.
  • the control unit 120 may include an application processor (AP).
  • the memory unit 130 may store data/parameters/programs/code/commands required for operation of the portable device 100. Further, the memory unit 130 may store input/output data/information.
  • the power supply unit 140a may supply power to the portable device 100, and include a wired/wireless charging circuit and a battery.
  • the interface unit 140b may include various ports (e.g., an audio I/O port and a video I/O port) for connectivity to external devices
  • the I/O unit 140c may acquire information/signals (e.g., touch, text, voice, images, and video) input by a user, and store the acquired information/signals in the memory unit 130.
  • the communication unit 110 may receive or output video information/signal, audio information/signal, data, and/or information input by the user.
  • the I/O unit 140c may include a camera, a microphone, a user input unit, a display 140d, a speaker, and/or a haptic module.
  • the I/O unit 140c may acquire information/signals (e.g., touch, text, voice, images, and video) received from the user and store the acquired information/signal sin the memory unit 130.
  • the communication unit 110 may convert the information/signals to radio signals and transmit the radio signals directly to another device or to a BS. Further, the communication unit 110 may receive a radio signal from another device or a BS and then restore the received radio signal to original information/signal.
  • the restored information/signal may be stored in the memory unit 130 and output in various forms (e.g., text, voice, an image, video, and a haptic effect) through the I/O unit 140c.
  • FIG. 31 illustrates a vehicle or an autonomous driving vehicle applied to the present disclosure.
  • the vehicle or autonomous driving vehicle may be configured as a mobile robot, a car, a train, a manned/unmanned aerial vehicle (AV), a ship, or the like.
  • AV manned/unmanned aerial vehicle
  • a vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d.
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • the blocks 110/130/140a to 140d correspond to the blocks 110/130/140 of FIG. 29 , respectively.
  • the communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and road side units), and servers.
  • the control unit 120 may perform various operations by controlling elements of the vehicle or the autonomous driving vehicle 100.
  • the control unit 120 may include an ECU.
  • the driving unit 140a may enable the vehicle or the autonomous driving vehicle 100 to travel on a road.
  • the driving unit 140a may include an engine, a motor, a powertrain, a wheel, a brake, a steering device, and so on.
  • the power supply unit 140b may supply power to the vehicle or the autonomous driving vehicle 100 and include a wired/wireless charging circuit, a battery, and so on.
  • the sensor unit 140c may acquire vehicle state information, ambient environment information, user information, and so on.
  • the sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, and so on.
  • IMU inertial measurement unit
  • the autonomous driving unit 140d may implement a technology for maintaining a lane on which a vehicle is driving, a technology for automatically adjusting speed, such as adaptive cruise control, a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a path, when a destination is set, and the like.
  • the communication unit 110 may receive map data, traffic information data, and so on from an external server.
  • the autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data.
  • the control unit 120 may control the driving unit 140a such that the vehicle or autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed/direction control).
  • the communication unit 110 may aperiodically/periodically acquire recent traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles.
  • the sensor unit 140c may obtain vehicle state information and/or ambient environment information.
  • the autonomous driving unit 140d may update the autonomous driving path and the driving plan based on the newly obtained data/information.
  • the communication unit 110 may transmit information about a vehicle position, the autonomous driving path, and/or the driving plan to the external server.
  • the external server may predict traffic information data using AI technology or the like, based on the information collected from vehicles or autonomous driving vehicles and provide the predicted traffic information data to the vehicles or the autonomous driving vehicles.
  • FIG. 32 illustrates an exemplary vehicle applied to the present disclosure.
  • the vehicle may be configured as a transportation means, a train, an aircraft, a ship, or the like.
  • a vehicle 100 may include a communication unit 110, a control unit 120, a memory unit 130, an I/O unit 140a, and a positioning unit 140b.
  • the blocks 110 to 130/140a and 140b correspond to the blocks 110 to 130/140 of FIG. 29 .
  • the communication unit 110 may transmit and receive signals (e.g., data, control signals, and so on) to and from external devices such as other vehicles or a BS.
  • the control unit 120 may perform various operations by controlling the components of the vehicle 100.
  • the memory unit 130 may store data/parameters/programs/code/commands supporting various functions of the vehicle 100.
  • the I/O unit 140a may output an AR/VR object based on information in the memory unit 130.
  • the I/O unit 140a may include an HUD.
  • the positioning unit 140b may acquire position information about the vehicle 100.
  • the position information may include absolute position information, information about a position within a lane, acceleration information, information about a position relative to a neighbor vehicle, and so on of the vehicle 100.
  • the positioning unit 140b may include a GPS and various sensors.
  • the communication unit 110 of the vehicle 100 may receive map information and traffic information from an external server and store the received information in the memory unit 130.
  • the positioning unit 140b may acquire vehicle position information through the GPS and various sensors and store the acquired vehicle position information in the memory unit 130.
  • the control unit 120 may generate a virtual object based on the map information, traffic information, and vehicle position information, and the I/O unit 140a may display the generated virtual object on a window in the vehicle (140m and 140n). Further, the control unit 120 may determine whether the vehicle 100 is traveling normally within a lane based on the vehicle position information. When the vehicle 100 is abnormally outside the lane, the control unit 120 may display a warning on a window in the vehicle via the I/O unit 140a. Further, the control unit 130 may broadcast a warning message about the abnormal driving to neighboring vehicles. Under circumstances, the control unit 120 may transmit position information about the vehicle and information about a driving/vehicle abnormality to an authority through the communication unit 110.
  • the present disclosure is applicable to wireless communication devices such as a user equipment (UE) and a base station (BS) operating in various wireless communication systems including 3GPP LTE/LTE-A/5G (or New RAT (NR)).
  • UE user equipment
  • BS base station
  • 3GPP LTE/LTE-A/5G or New RAT (NR)

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Claims (14)

  1. Verfahren zum Empfangen eines Funkrufsignals durch eine Benutzerausrüstung, UE, (100, 200) in einem drahtlosen Kommunikationssystem, das NarrowBand-Internet der Dinge, NB-loT, unterstützt, wobei das Verfahren Folgendes umfasst:
    Bestimmen (S2602) von Indexinformationen, die eine Wecksignal-, WUS-, Gruppe für die UE (100, 200) anzeigen, wobei eine WUS-Ressource für die UE (100, 200) basierend auf den bestimmten Indexinformationen ausgewählt wird; und
    Überwachen (S2604) eines WUS für die UE (100, 200) basierend auf der ausgewählten WUS-Ressource, wobei die Indexinformationen, die die WUS-Gruppe für die UE (100, 200) angeben, basierend auf allen folgenden Parametern bestimmt werden:
    - Identifikationsinformationen der UE (100, 200),
    - Parameter, die sich auf einen diskontinuierlichen Empfangszyklus, DRX, der UE (100, 200) beziehen,
    - eine Summe der Gewichte für Funkruf-Träger, und
    - Informationen über eine Anzahl von UE-Gruppen für das WUS.
  2. Verfahren nach Anspruch 1, wobei die Indexinformationen, die die WUS-Gruppe für die UE angeben, basierend auf der folgenden Gleichung bestimmt werden, c g = floor UE _ ID / N ∗ N S ∗ W mod N SG
    Figure imgb0075
     wobei cg die Indexinformation darstellt, die die WUS-Gruppe für die UE angibt, UE_ID die Identifikationsinformation der UE darstellt, N und Ns die Parameter im Zusammenhang mit dem DRX-Zyklus der UE darstellen, W die Summe der Gewichte für Funkruf-Träger darstellt und NSG die Information über die Anzahl der UE-Gruppen für das WUS darstellt.
  3. Verfahren nach Anspruch 2,
    wobei die UE_ID basierend auf den Informationen zur internationalen Mobilteilnehmeridentität, IMSI, der UE (100, 200) bestimmt wird,
    wobei N basierend auf min(T, nB) bestimmt wird und NS basierend auf max(1, nB/T) bestimmt wird, wobei T den DRX-Zyklus der UE darstellt, nB durch Systeminformationen angezeigt wird, min(A, B) einen kleineren Wert zwischen A und B darstellt, und max(A, B) einen größeren Wert zwischen A und B darstellt, und wobei die Gewichte für Funkruf-Träger basierend auf den Systeminformationen bestimmt werden.
  4. Verfahren nach Anspruch 1, wobei die WUS-Ressource eine Ressource in mindestens einer von einer Zeitdomäne, einer Frequenzdomäne oder einer Code-Domäne einschließt.
  5. Verfahren nach Anspruch 1, das ferner Folgendes umfasst:
    basierend auf der Erkennung des WUS, Empfangen des Funkrufsignals in einer Funkrufsituation, die mit dem WUS zusammenhängt.
  6. Verfahren nach Anspruch 1, wobei die Indexinformationen, die die WUS-Gruppe für die UE angeben, im Laufe der Zeit springen.
  7. Verfahren nach Anspruch 6, wobei ein Sprungmuster für die Indexinformationen, die die WUS-Gruppe für die UE (100, 200) angeben, basierend auf einer Systemrahmennummer, SFN, bestimmt wird.
  8. Benutzerausrüstung, UE, (100, 200), die konfiguriert ist, um ein Funkrufsignal in einem drahtlosen Kommunikationssystem zu empfangen, das NarrowBand-Internet der Dinge, NB-loT, unterstützt, wobei die UE (100, 200) Folgendes umfasst:
    einen Radiofrequenz-, RF-, Sendeempfänger (106, 206); und
    einen Prozessor (102, 202), der operativ mit dem RF-Sendeempfänger (106, 206) verbunden ist,
    wobei der Prozessor (102, 202) so konfiguriert ist, dass er Indexinformationen bestimmt, die eine Wecksignal-, WUS-, Gruppe für die UE (100, 200) angeben, wobei eine WUS-Ressource für die UE (100, 200) basierend auf den bestimmten Indexinformationen ausgewählt wird, und dass er den RF-Sendeempfänger steuert, um ein WUS für die UE (100, 200) basierend auf der ausgewählten WUS-Ressource zu überwachen, und
    wobei die Indexinformationen, die die WUS-Gruppe für die UE (100, 200) angeben,
    auf der Grundlage aller folgenden Parameter bestimmt werden:
    - Identifikationsinformationen der UE (100, 200),
    - Parameter, die sich auf einen diskontinuierlichen Empfangszyklus, DRX, der UE (100, 200) beziehen,
    - eine Summe der Gewichte für Funkruf-Träger, und
    - Informationen über eine Anzahl von UE-Gruppen für das WUS.
  9. UE (100, 200) nach Anspruch 8, wobei die Indexinformationen, die die WUS-Gruppe für die UE angeben, basierend auf der folgenden Gleichung bestimmt werden, wobei cg die Indexinformation darstellt, die die WUS-Gruppe für die UE angibt, c g = floor UE _ ID / N ∗ N S ∗ W mod N SG
    Figure imgb0076
     UE_ID die Identifikationsinformation der UE darstellt, N und NS die Parameter im Zusammenhang mit dem DRX-Zyklus der UE darstellen, W die Summe der Gewichte für Funkruf-Träger darstellt und NSG die Information über die Anzahl der UE-Gruppen für das WUS darstellt.
  10. UE (100, 200) nach Anspruch 9, wobei die UE_ID basierend auf den Informationen zur internationalen Mobilteilnehmeridentität, IMSI, der UE (100, 200) bestimmt wird,
    wobei N basierend auf min(T, nB) bestimmt wird und NS basierend auf max(1, nB/T) bestimmt wird, wobei T den DRX-Zyklus der UE darstellt, nB durch Systeminformationen angezeigt wird, min(A, B) einen kleineren Wert zwischen A und B darstellt, und max(A, B) einen größeren Wert zwischen A und B darstellt, und wobei die Gewichte für Funkruf-Träger basierend auf den Systeminformationen bestimmt werden.
  11. UE (100, 200) nach Anspruch 8, wobei die WUS-Ressource eine Ressource in mindestens einer von einer Zeitdomäne, einer Frequenzdomäne oder einer Code-Domäne einschließt.
  12. UE (100, 200) nach Anspruch 8, wobei der Prozessor (102, 202) ferner so konfiguriert ist, dass er, basierend auf der Erkennung des WUS, den RF-Sendeempfänger zum Empfangen des Funkrufsignals in einer Funkrufsituation, die mit dem WUS zusammenhängt, steuert.
  13. UE (100, 200) nach Anspruch 8, wobei die Indexinformationen, die die WUS-Gruppe für die UE angeben, im Laufe der Zeit springen.
  14. UE (100, 200) nach Anspruch 13, wobei ein Sprungmuster für die Indexinformationen, die die WUS-Gruppe für die UE angeben, basierend auf einer Systemrahmennummer, SFN, bestimmt wird.
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CN113630216B (zh) * 2016-08-22 2024-05-28 三星电子株式会社 在无线蜂窝通信系统中用于提供初始接入过程的各种参数的方法和设备
US10432378B2 (en) * 2016-09-30 2019-10-01 Qualcomm Incorporated Use of reference signals to improve user equipment (UE) warm-up before transitioning from an OFF duration of the UE to an on duration of the UE with respect to a radio frequency spectrum band

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WO2020032740A1 (ko) 2020-02-13
CN112055986B (zh) 2023-05-30
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JP2022043206A (ja) 2022-03-15
JP2021516025A (ja) 2021-06-24
KR102194933B1 (ko) 2020-12-24
US20200396687A1 (en) 2020-12-17
US11943714B2 (en) 2024-03-26
US11425654B2 (en) 2022-08-23
US20220408359A1 (en) 2022-12-22
JP7000603B2 (ja) 2022-01-19
US20210219234A1 (en) 2021-07-15
EP3742820A1 (de) 2020-11-25
CN112055986A (zh) 2020-12-08
EP3742820A4 (de) 2021-03-31
US11051250B2 (en) 2021-06-29

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